Removed files auto-generated by infrastructure/ace/bin/make

13 files changed, 12 insertions, 7175 deletions

diff --git a/.gitignore b/.gitignore
index b25c15b..e48532d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,13 @@
 *~
+etherpad/src/etherpad/collab/ace/contentcollector.js
+etherpad/src/etherpad/collab/ace/domline.js
+etherpad/src/etherpad/collab/ace/easysync1.js
+etherpad/src/etherpad/collab/ace/easysync2.js
+etherpad/src/etherpad/collab/ace/easysync2_tests.js
+etherpad/src/etherpad/collab/ace/linestylefilter.js
+etherpad/src/static/js/ace.js
+etherpad/src/static/js/colorutils.js
+etherpad/src/static/js/cssmanager_client.js
+etherpad/src/static/js/domline_client.js
+etherpad/src/static/js/easysync2_client.js
+etherpad/src/static/js/linestylefilter_client.js
diff --git a/etherpad/src/etherpad/collab/ace/contentcollector.js b/etherpad/src/etherpad/collab/ace/contentcollector.js
deleted file mode 100644
index 22e552a..0000000
--- a/etherpad/src/etherpad/collab/ace/contentcollector.js
+++ /dev/null
@@ -1,509 +0,0 @@
-// DO NOT EDIT THIS FILE, edit infrastructure/ace/www/contentcollector.js
-import("etherpad.collab.ace.easysync2.Changeset")
-
-/**
- * Copyright 2009 Google Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS-IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-var _MAX_LIST_LEVEL = 8;
-
-function sanitizeUnicode(s) {
-  return s.replace(/[\uffff\ufffe\ufeff\ufdd0-\ufdef\ud800-\udfff]/g, '?');
-}
-
-function makeContentCollector(collectStyles, browser, apool, domInterface,
-                              className2Author) {
-  browser = browser || {};
-
-  var dom = domInterface || {
-    isNodeText: function(n) {
-      return (n.nodeType == 3);
-    },
-    nodeTagName: function(n) {
-      return n.tagName;
-    },
-    nodeValue: function(n) {
-      return n.nodeValue;
-    },
-    nodeNumChildren: function(n) {
-      return n.childNodes.length;
-    },
-    nodeChild: function(n, i) {
-      return n.childNodes.item(i);
-    },
-    nodeProp: function(n, p) {
-      return n[p];
-    },
-    nodeAttr: function(n, a) {
-      return n.getAttribute(a);
-    },
-    optNodeInnerHTML: function(n) {
-      return n.innerHTML;
-    }
-  };
-
-  var _blockElems = { "div":1, "p":1, "pre":1, "li":1 };
-  function isBlockElement(n) {
-    return !!_blockElems[(dom.nodeTagName(n) || "").toLowerCase()];
-  }
-  function textify(str) {
-    return sanitizeUnicode(
-      str.replace(/[\n\r ]/g, ' ').replace(/\xa0/g, ' ').replace(/\t/g, '        '));
-  }
-  function getAssoc(node, name) {
-    return dom.nodeProp(node, "_magicdom_"+name);
-  }
-
-  var lines = (function() {
-    var textArray = [];
-    var attribsArray = [];
-    var attribsBuilder = null;
-    var op = Changeset.newOp('+');
-    var self = {
-      length: function() { return textArray.length; },
-      atColumnZero: function() {
-        return textArray[textArray.length-1] === "";
-      },
-      startNew: function() {
-        textArray.push("");
-        self.flush(true);
-        attribsBuilder = Changeset.smartOpAssembler();
-      },
-      textOfLine: function(i) { return textArray[i]; },
-      appendText: function(txt, attrString) {
-        textArray[textArray.length-1] += txt;
-        //dmesg(txt+" / "+attrString);
-        op.attribs = attrString;
-        op.chars = txt.length;
-        attribsBuilder.append(op);
-      },
-      textLines: function() { return textArray.slice(); },
-      attribLines: function() { return attribsArray; },
-      // call flush only when you're done
-      flush: function(withNewline) {
-        if (attribsBuilder) {
-          attribsArray.push(attribsBuilder.toString());
-          attribsBuilder = null;
-        }
-      }
-    };
-    self.startNew();
-    return self;
-  }());
-  var cc = {};
-  function _ensureColumnZero(state) {
-    if (! lines.atColumnZero()) {
-      _startNewLine(state);
-    }
-  }
-  var selection, startPoint, endPoint;
-  var selStart = [-1,-1], selEnd = [-1,-1];
-  var blockElems = { "div":1, "p":1, "pre":1 };
-  function _isEmpty(node, state) {
-    // consider clean blank lines pasted in IE to be empty
-    if (dom.nodeNumChildren(node) == 0) return true;
-    if (dom.nodeNumChildren(node) == 1 &&
-        getAssoc(node, "shouldBeEmpty") && dom.optNodeInnerHTML(node) == " "
-        && ! getAssoc(node, "unpasted")) {
-      if (state) {
-        var child = dom.nodeChild(node, 0);
-        _reachPoint(child, 0, state);
-        _reachPoint(child, 1, state);
-      }
-      return true;
-    }
-    return false;
-  }
-  function _pointHere(charsAfter, state) {
-    var ln = lines.length()-1;
-    var chr = lines.textOfLine(ln).length;
-    if (chr == 0 && state.listType && state.listType != 'none') {
-      chr += 1; // listMarker
-    }
-    chr += charsAfter;
-    return [ln, chr];
-  }
-  function _reachBlockPoint(nd, idx, state) {
-    if (! dom.isNodeText(nd)) _reachPoint(nd, idx, state);
-  }
-  function _reachPoint(nd, idx, state) {
-    if (startPoint && nd == startPoint.node && startPoint.index == idx) {
-      selStart = _pointHere(0, state);
-    }
-    if (endPoint && nd == endPoint.node && endPoint.index == idx) {
-      selEnd = _pointHere(0, state);
-    }
-  }
-  function _incrementFlag(state, flagName) {
-    state.flags[flagName] = (state.flags[flagName] || 0)+1;
-  }
-  function _decrementFlag(state, flagName) {
-    state.flags[flagName]--;
-  }
-  function _incrementAttrib(state, attribName) {
-    if (! state.attribs[attribName]) {
-      state.attribs[attribName] = 1;
-    }
-    else {
-      state.attribs[attribName]++;
-    }
-    _recalcAttribString(state);
-  }
-  function _decrementAttrib(state, attribName) {
-    state.attribs[attribName]--;
-    _recalcAttribString(state);
-  }
-  function _enterList(state, listType) {
-    var oldListType = state.listType;
-    state.listLevel = (state.listLevel || 0)+1;
-    if (listType != 'none') {
-      state.listNesting = (state.listNesting || 0)+1;
-    }
-    state.listType = listType;
-    _recalcAttribString(state);
-    return oldListType;
-  }
-  function _exitList(state, oldListType) {
-    state.listLevel--;
-    if (state.listType != 'none') {
-      state.listNesting--;
-    }
-    state.listType = oldListType;
-    _recalcAttribString(state);
-  }
-  function _enterAuthor(state, author) {
-    var oldAuthor = state.author;
-    state.authorLevel = (state.authorLevel || 0)+1;
-    state.author = author;
-    _recalcAttribString(state);
-    return oldAuthor;
-  }
-  function _exitAuthor(state, oldAuthor) {
-    state.authorLevel--;
-    state.author = oldAuthor;
-    _recalcAttribString(state);
-  }
-  function _recalcAttribString(state) {
-    var lst = [];
-    for(var a in state.attribs) {
-      if (state.attribs[a]) {
-        lst.push([a,'true']);
-      }
-    }
-    if (state.authorLevel > 0) {
-      var authorAttrib = ['author', state.author];
-      if (apool.putAttrib(authorAttrib, true) >= 0) {
-        // require that author already be in pool
-        // (don't add authors from other documents, etc.)
-        lst.push(authorAttrib);
-      }
-    }
-    state.attribString = Changeset.makeAttribsString('+', lst, apool);
-  }
-  function _produceListMarker(state) {
-    lines.appendText('*', Changeset.makeAttribsString(
-      '+', [['list', state.listType],
-            ['insertorder', 'first']],
-      apool));
-  }
-  function _startNewLine(state) {
-    if (state) {
-      var atBeginningOfLine = lines.textOfLine(lines.length()-1).length == 0;
-      if (atBeginningOfLine && state.listType && state.listType != 'none') {
-        _produceListMarker(state);
-      }
-    }
-    lines.startNew();
-  }
-  cc.notifySelection = function (sel) {
-    if (sel) {
-      selection = sel;
-      startPoint = selection.startPoint;
-      endPoint = selection.endPoint;
-    }
-  };
-  cc.collectContent = function (node, state) {
-    if (! state) {
-      state = {flags: {/*name -> nesting counter*/},
-               attribs: {/*name -> nesting counter*/},
-               attribString: ''};
-    }
-    var isBlock = isBlockElement(node);
-    var isEmpty = _isEmpty(node, state);
-    if (isBlock) _ensureColumnZero(state);
-    var startLine = lines.length()-1;
-    _reachBlockPoint(node, 0, state);
-    if (dom.isNodeText(node)) {
-      var txt = dom.nodeValue(node);
-      var rest = '';
-      var x = 0; // offset into original text
-      if (txt.length == 0) {
-        if (startPoint && node == startPoint.node) {
-          selStart = _pointHere(0, state);
-        }
-        if (endPoint && node == endPoint.node) {
-          selEnd = _pointHere(0, state);
-        }
-      }
-      while (txt.length > 0) {
-        var consumed = 0;
-        if (state.flags.preMode) {
-          var firstLine = txt.split('\n',1)[0];
-          consumed = firstLine.length+1;
-          rest = txt.substring(consumed);
-          txt = firstLine;
-        }
-        else { /* will only run this loop body once */ }
-        if (startPoint && node == startPoint.node &&
-            startPoint.index-x <= txt.length) {
-          selStart = _pointHere(startPoint.index-x, state);
-        }
-        if (endPoint && node == endPoint.node &&
-            endPoint.index-x <= txt.length) {
-          selEnd = _pointHere(endPoint.index-x, state);
-        }
-        var txt2 = txt;
-        if ((! state.flags.preMode) && /^[\r\n]*$/.exec(txt)) {
-          // prevents textnodes containing just "\n" from being significant
-          // in safari when pasting text, now that we convert them to
-          // spaces instead of removing them, because in other cases
-          // removing "\n" from pasted HTML will collapse words together.
-          txt2 = "";
-        }
-        var atBeginningOfLine = lines.textOfLine(lines.length()-1).length == 0;
-        if (atBeginningOfLine) {
-          // newlines in the source mustn't become spaces at beginning of line box
-          txt2 = txt2.replace(/^\n*/, '');
-        }
-        if (atBeginningOfLine && state.listType && state.listType != 'none') {
-          _produceListMarker(state);
-        }
-        lines.appendText(textify(txt2), state.attribString);
-        x += consumed;
-        txt = rest;
-        if (txt.length > 0) {
-          _startNewLine(state);
-        }
-      }
-    }
-    else {
-      var tname = (dom.nodeTagName(node) || "").toLowerCase();
-      if (tname == "br") {
-        _startNewLine(state);
-      }
-      else if (tname == "script" || tname == "style") {
-        // ignore
-      }
-      else if (! isEmpty) {
-        var styl = dom.nodeAttr(node, "style");
-        var cls = dom.nodeProp(node, "className");
-
-        var isPre = (tname == "pre");
-        if ((! isPre) && browser.safari) {
-          isPre = (styl && /\bwhite-space:\s*pre\b/i.exec(styl));
-        }
-        if (isPre) _incrementFlag(state, 'preMode');
-        var attribs = null;
-        var oldListTypeOrNull = null;
-        var oldAuthorOrNull = null;
-        if (collectStyles) {
-          function doAttrib(na) {
-            attribs = (attribs || []);
-            attribs.push(na);
-            _incrementAttrib(state, na);
-          }
-          if (tname == "b" || (styl && /\bfont-weight:\s*bold\b/i.exec(styl)) ||
-              tname == "strong") {
-            doAttrib("bold");
-          }
-          if (tname == "i" || (styl && /\bfont-style:\s*italic\b/i.exec(styl)) ||
-              tname == "em") {
-            doAttrib("italic");
-          }
-          if (tname == "u" || (styl && /\btext-decoration:\s*underline\b/i.exec(styl)) ||
-              tname == "ins") {
-            doAttrib("underline");
-          }
-          if (tname == "s" || (styl && /\btext-decoration:\s*line-through\b/i.exec(styl)) ||
-              tname == "del") {
-            doAttrib("strikethrough");
-          }
-          if (tname == "ul") {
-            var type;
-            var rr = cls &&  /(?:^| )list-(bullet[12345678])\b/.exec(cls);
-            type = rr && rr[1] || "bullet"+
-              String(Math.min(_MAX_LIST_LEVEL, (state.listNesting||0)+1));
-            oldListTypeOrNull = (_enterList(state, type) || 'none');
-          }
-          else if ((tname == "div" || tname == "p") && cls &&
-              cls.match(/(?:^| )ace-line\b/)) {
-            oldListTypeOrNull = (_enterList(state, type) || 'none');
-          }
-          if (className2Author && cls) {
-            var classes = cls.match(/\S+/g);
-            if (classes && classes.length > 0) {
-              for(var i=0;i<classes.length;i++) {
-                var c = classes[i];
-                var a = className2Author(c);
-                if (a) {
-                  oldAuthorOrNull = (_enterAuthor(state, a) || 'none');
-                  break;
-                }
-              }
-            }
-          }
-        }
-
-        var nc = dom.nodeNumChildren(node);
-        for(var i=0;i<nc;i++) {
-          var c = dom.nodeChild(node, i);
-          cc.collectContent(c, state);
-        }
-
-        if (isPre) _decrementFlag(state, 'preMode');
-        if (attribs) {
-          for(var i=0;i<attribs.length;i++) {
-            _decrementAttrib(state, attribs[i]);
-          }
-        }
-        if (oldListTypeOrNull) {
-          _exitList(state, oldListTypeOrNull);
-        }
-        if (oldAuthorOrNull) {
-          _exitAuthor(state, oldAuthorOrNull);
-        }
-      }
-    }
-    if (! browser.msie) {
-      _reachBlockPoint(node, 1, state);
-    }
-    if (isBlock) {
-      if (lines.length()-1 == startLine) {
-        _startNewLine(state);
-      }
-      else {
-        _ensureColumnZero(state);
-      }
-    }
-
-    if (browser.msie) {
-      // in IE, a point immediately after a DIV appears on the next line
-      _reachBlockPoint(node, 1, state);
-    }
-  };
-  // can pass a falsy value for end of doc
-  cc.notifyNextNode = function (node) {
-    // an "empty block" won't end a line; this addresses an issue in IE with
-    // typing into a blank line at the end of the document.  typed text
-    // goes into the body, and the empty line div still looks clean.
-    // it is incorporated as dirty by the rule that a dirty region has
-    // to end a line.
-    if ((!node) || (isBlockElement(node) && !_isEmpty(node))) {
-      _ensureColumnZero(null);
-    }
-  };
-  // each returns [line, char] or [-1,-1]
-  var getSelectionStart = function() { return selStart; };
-  var getSelectionEnd = function() { return selEnd; };
-
-  // returns array of strings for lines found, last entry will be "" if
-  // last line is complete (i.e. if a following span should be on a new line).
-  // can be called at any point
-  cc.getLines = function() { return lines.textLines(); };
-
-  //cc.applyHints = function(hints) {
-  //if (hints.pastedLines) {
-  //
-  //}
-  //}
-
-  cc.finish = function() {
-    lines.flush();
-    var lineAttribs = lines.attribLines();
-    var lineStrings = cc.getLines();
-
-    lineStrings.length--;
-    lineAttribs.length--;
-
-    var ss = getSelectionStart();
-    var se = getSelectionEnd();
-
-    function fixLongLines() {
-      // design mode does not deal with with really long lines!
-      var lineLimit = 2000; // chars
-      var buffer = 10; // chars allowed over before wrapping
-      var linesWrapped = 0;
-      var numLinesAfter = 0;
-      for(var i=lineStrings.length-1; i>=0; i--) {
-	var oldString = lineStrings[i];
-	var oldAttribString = lineAttribs[i];
-	if (oldString.length > lineLimit+buffer) {
-	  var newStrings = [];
-	  var newAttribStrings = [];
-	  while (oldString.length > lineLimit) {
-	    //var semiloc = oldString.lastIndexOf(';', lineLimit-1);
-	    //var lengthToTake = (semiloc >= 0 ? (semiloc+1) : lineLimit);
-	    lengthToTake = lineLimit;
-	    newStrings.push(oldString.substring(0, lengthToTake));
-	    oldString = oldString.substring(lengthToTake);
-	    newAttribStrings.push(Changeset.subattribution(oldAttribString,
-							   0, lengthToTake));
-	    oldAttribString = Changeset.subattribution(oldAttribString,
-						       lengthToTake);
-	  }
-	  if (oldString.length > 0) {
-	    newStrings.push(oldString);
-	    newAttribStrings.push(oldAttribString);
-	  }
-	  function fixLineNumber(lineChar) {
-	    if (lineChar[0] < 0) return;
-	    var n = lineChar[0];
-	    var c = lineChar[1];
-	    if (n > i) {
-	      n += (newStrings.length-1);
-	    }
-	    else if (n == i) {
-	      var a = 0;
-	      while (c > newStrings[a].length) {
-		c -= newStrings[a].length;
-		a++;
-	      }
-	      n += a;
-	    }
-	    lineChar[0] = n;
-	    lineChar[1] = c;
-	  }
-	  fixLineNumber(ss);
-	  fixLineNumber(se);
-	  linesWrapped++;
-	  numLinesAfter += newStrings.length;
-
-	  newStrings.unshift(i, 1);
-	  lineStrings.splice.apply(lineStrings, newStrings);
-	  newAttribStrings.unshift(i, 1);
-	  lineAttribs.splice.apply(lineAttribs, newAttribStrings);
-	}
-      }
-      return {linesWrapped:linesWrapped, numLinesAfter:numLinesAfter};
-    }
-    var wrapData = fixLongLines();
-
-    return { selStart: ss, selEnd: se, linesWrapped: wrapData.linesWrapped,
-             numLinesAfter: wrapData.numLinesAfter,
-             lines: lineStrings, lineAttribs: lineAttribs };
-  }
-
-  return cc;
-}
diff --git a/etherpad/src/etherpad/collab/ace/domline.js b/etherpad/src/etherpad/collab/ace/domline.js
deleted file mode 100644
index de2e7d3..0000000
--- a/etherpad/src/etherpad/collab/ace/domline.js
+++ /dev/null
@@ -1,210 +0,0 @@
-// DO NOT EDIT THIS FILE, edit infrastructure/ace/www/domline.js
-
-/**
- * Copyright 2009 Google Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS-IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-var domline = {};
-domline.noop = function() {};
-domline.identity = function(x) { return x; };
-
-domline.addToLineClass = function(lineClass, cls) {
-  // an "empty span" at any point can be used to add classes to
-  // the line, using line:className.  otherwise, we ignore
-  // the span.
-  cls.replace(/\S+/g, function (c) {
-    if (c.indexOf("line:") == 0) {
-      // add class to line
-      lineClass = (lineClass ? lineClass+' ' : '')+c.substring(5);
-    }
-  });
-  return lineClass;
-}
-
-// if "document" is falsy we don't create a DOM node, just
-// an object with innerHTML and className
-domline.createDomLine = function(nonEmpty, doesWrap, optBrowser, optDocument) {
-  var result = { node: null,
-                 appendSpan: domline.noop,
-                 prepareForAdd: domline.noop,
-                 notifyAdded: domline.noop,
-                 clearSpans: domline.noop,
-                 finishUpdate: domline.noop,
-                 lineMarker: 0 };
-
-  var browser = (optBrowser || {});
-  var document = optDocument;
-
-  if (document) {
-    result.node = document.createElement("div");
-  }
-  else {
-    result.node = {innerHTML: '', className: ''};
-  }
-
-  var html = [];
-  var preHtml, postHtml;
-  var curHTML = null;
-  function processSpaces(s) {
-    return domline.processSpaces(s, doesWrap);
-  }
-  var identity = domline.identity;
-  var perTextNodeProcess = (doesWrap ? identity : processSpaces);
-  var perHtmlLineProcess = (doesWrap ? processSpaces : identity);
-  var lineClass = 'ace-line';
-  result.appendSpan = function(txt, cls) {
-    if (cls.indexOf('list') >= 0) {
-      var listType = /(?:^| )list:(\S+)/.exec(cls);
-      if (listType) {
-        listType = listType[1];
-        if (listType) {
-          preHtml = '<ul class="list-'+listType+'"><li>';
-          postHtml = '</li></ul>';
-        }
-        result.lineMarker += txt.length;
-        return; // don't append any text
-      }
-    }
-    var href = null;
-    var simpleTags = null;
-    if (cls.indexOf('url') >= 0) {
-      cls = cls.replace(/(^| )url:(\S+)/g, function(x0, space, url) {
-	href = url;
-	return space+"url";
-      });
-    }
-    if (cls.indexOf('tag') >= 0) {
-      cls = cls.replace(/(^| )tag:(\S+)/g, function(x0, space, tag) {
-	if (! simpleTags) simpleTags = [];
-	simpleTags.push(tag.toLowerCase());
-	return space+tag;
-      });
-    }
-    if ((! txt) && cls) {
-      lineClass = domline.addToLineClass(lineClass, cls);
-    }
-    else if (txt) {
-      var extraOpenTags = "";
-      var extraCloseTags = "";
-      if (href) {
-	extraOpenTags = extraOpenTags+'<a href="'+
-	  href.replace(/\"/g, '&quot;')+'">';
-	extraCloseTags = '</a>'+extraCloseTags;
-      }
-      if (simpleTags) {
-	simpleTags.sort();
-	extraOpenTags = extraOpenTags+'<'+simpleTags.join('><')+'>';
-	simpleTags.reverse();
-	extraCloseTags = '</'+simpleTags.join('></')+'>'+extraCloseTags;
-      }
-      html.push('<span class="',cls||'','">',extraOpenTags,
-		perTextNodeProcess(domline.escapeHTML(txt)),
-                extraCloseTags,'</span>');
-    }
-  };
-  result.clearSpans = function() {
-    html = [];
-    lineClass = ''; // non-null to cause update
-    result.lineMarker = 0;
-  };
-  function writeHTML() {
-    var newHTML = perHtmlLineProcess(html.join(''));
-    if (! newHTML) {
-      if ((! document) || (! optBrowser)) {
-        newHTML += '&nbsp;';
-      }
-      else if (! browser.msie) {
-        newHTML += '<br/>';
-      }
-    }
-    if (nonEmpty) {
-      newHTML = (preHtml||'')+newHTML+(postHtml||'');
-    }
-    html = preHtml = postHtml = null; // free memory
-    if (newHTML !== curHTML) {
-      curHTML = newHTML;
-      result.node.innerHTML = curHTML;
-    }
-    if (lineClass !== null) result.node.className = lineClass;
-  }
-  result.prepareForAdd = writeHTML;
-  result.finishUpdate = writeHTML;
-  result.getInnerHTML = function() { return curHTML || ''; };
-
-  return result;
-};
-
-domline.escapeHTML = function(s) {
-  var re = /[&<>'"]/g; /']/; // stupid indentation thing
-  if (! re.MAP) {
-    // persisted across function calls!
-    re.MAP = {
-      '&': '&amp;',
-      '<': '&lt;',
-      '>': '&gt;',
-      '"': '&#34;',
-      "'": '&#39;'
-    };
-  }
-  return s.replace(re, function(c) { return re.MAP[c]; });
-};
-
-domline.processSpaces = function(s, doesWrap) {
-  if (s.indexOf("<") < 0 && ! doesWrap) {
-    // short-cut
-    return s.replace(/ /g, '&nbsp;');
-  }
-  var parts = [];
-  s.replace(/<[^>]*>?| |[^ <]+/g, function(m) { parts.push(m); });
-  if (doesWrap) {
-    var endOfLine = true;
-    var beforeSpace = false;
-    // last space in a run is normal, others are nbsp,
-    // end of line is nbsp
-    for(var i=parts.length-1;i>=0;i--) {
-      var p = parts[i];
-      if (p == " ") {
-	if (endOfLine || beforeSpace)
-	  parts[i] = '&nbsp;';
-	endOfLine = false;
-	beforeSpace = true;
-      }
-      else if (p.charAt(0) != "<") {
-	endOfLine = false;
-	beforeSpace = false;
-      }
-    }
-    // beginning of line is nbsp
-    for(var i=0;i<parts.length;i++) {
-      var p = parts[i];
-      if (p == " ") {
-	parts[i] = '&nbsp;';
-	break;
-      }
-      else if (p.charAt(0) != "<") {
-	break;
-      }
-    }
-  }
-  else {
-    for(var i=0;i<parts.length;i++) {
-      var p = parts[i];
-      if (p == " ") {
-	parts[i] = '&nbsp;';
-      }
-    }
-  }
-  return parts.join('');
-};
diff --git a/etherpad/src/etherpad/collab/ace/easysync1.js b/etherpad/src/etherpad/collab/ace/easysync1.js
deleted file mode 100644
index 4f40aa0..0000000
--- a/etherpad/src/etherpad/collab/ace/easysync1.js
+++ /dev/null
@@ -1,923 +0,0 @@
-// DO NOT EDIT THIS FILE, edit infrastructure/ace/www/easy_sync.js
-
-/**
- * Copyright 2009 Google Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS-IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-function Changeset(arg) {
-
-  var array;
-  if ((typeof arg) == "string") {
-    // constant
-    array = [Changeset.MAGIC, 0, arg.length, 0, 0, arg];
-  }
-  else if ((typeof arg) == "number") {
-    var n = Math.round(arg);
-    // delete-all on n-length text (useful for making a "builder")
-    array = [Changeset.MAGIC, n, 0, 0, 0, ""];
-  }
-  else if (! arg) {
-    // identity on 0-length text
-    array = [Changeset.MAGIC, 0, 0, 0, 0, ""];
-  }
-  else if (arg.isChangeset) {
-    return arg;
-  }
-  else array = arg;
-
-  array.isChangeset = true;
-
-  // OOP style: attach generic methods to array object, hold no state in environment
-
-  //function error(msg) { top.console.error(msg); top.console.trace(); }
-  function error(msg) { var e = new Error(msg); e.easysync = true; throw e; }
-  function assert(b, msg) { if (! b) error("Changeset: "+String(msg)); }
-  function min(x, y) { return (x < y) ? x : y; }
-  Changeset._assert = assert;
-
-  array.isIdentity = function() {
-    return this.length == 6 && this[1] == this[2] && this[3] == 0 &&
-      this[4] == this[1] && this[5] == "";
-  }
-
-  array.eachStrip = function(func, thisObj) {
-    // inside "func", the method receiver will be "this" by default,
-    // or you can pass an object.
-    for(var i=0;i<this.numStrips();i++) {
-      var ptr = 3 + i*3;
-      if (func.call(thisObj || this, this[ptr], this[ptr+1], this[ptr+2], i))
-	return true;
-    }
-    return false;
-  }
-
-  array.numStrips = function() { return (this.length-3)/3; };
-  array.oldLen = function() { return this[1]; };
-  array.newLen = function() { return this[2]; };
-
-  array.checkRep = function() {
-    assert(this[0] == Changeset.MAGIC, "bad magic");
-    assert(this[1] >= 0, "bad old text length");
-    assert(this[2] >= 0, "bad new text length");
-    assert((this.length % 3) == 0, "bad array length");
-    assert(this.length >= 6, "must be at least one strip");
-    var numStrips = this.numStrips();
-    var oldLen = this[1];
-    var newLen = this[2];
-    // iterate over the "text strips"
-    var actualNewLen = 0;
-    this.eachStrip(function(startIndex, numTaken, newText, i) {
-      var s = startIndex, t = numTaken, n = newText;
-      var isFirst = (i == 0);
-      var isLast = (i == numStrips-1);
-      assert(t >= 0, "can't take negative number of chars");
-      assert(isFirst || t > 0, "all strips but first must take");
-      assert((t > 0) || (s == 0), "if first strip doesn't take, must have 0 startIndex");
-      assert(s >= 0 && s + t <= oldLen, "bad index: "+this.toString());
-      assert(t > 0 || n.length > 0 || (isFirst && isLast), "empty strip must be first and only");
-      if (! isLast) {
-	var s2 = this[3 + i*3 + 3]; // startIndex of following strip
-	var gap = s2 - (s + t);
-	assert(gap >= 0, "overlapping or out-of-order strips: "+this.toString());
-	assert(gap > 0 || n.length > 0, "touching strips with no added text");
-      }
-      actualNewLen += t + n.length;
-    });
-    assert(newLen == actualNewLen, "calculated new text length doesn't match");
-  }
-
-  array.applyToText = function(text) {
-    assert(text.length == this.oldLen(), "mismatched apply: "+text.length+" / "+this.oldLen());
-    var buf = [];
-    this.eachStrip(function (s, t, n) {
-      buf.push(text.substr(s, t), n);
-    });
-    return buf.join('');
-  }
-
-  function _makeBuilder(oldLen, supportAuthors) {
-    var C = Changeset(oldLen);
-    if (supportAuthors) {
-      _ensureAuthors(C);
-    }
-    return C.builder();
-  }
-
-  function _getNumInserted(C) {
-    var numChars = 0;
-    C.eachStrip(function(s,t,n) {
-      numChars += n.length;
-    });
-    return numChars;
-  }
-
-  function _ensureAuthors(C) {
-    if (! C.authors) {
-      C.setAuthor();
-    }
-    return C;
-  }
-
-  array.setAuthor = function(author) {
-    var C = this;
-    // authors array has even length >= 2;
-    // alternates [numChars1, author1, numChars2, author2];
-    // all numChars > 0 unless there is exactly one, in which
-    // case it can be == 0.
-    C.authors = [_getNumInserted(C), author || ''];
-    return C;
-  }
-
-  array.builder = function() {
-    // normal pattern is Changeset(oldLength).builder().appendOldText(...). ...
-    // builder methods mutate this!
-    var C = this;
-    // OOP style: state in environment
-    var self;
-    return self = {
-      appendNewText: function(str, author) {
-	C[C.length-1] += str;
-	C[2] += str.length;
-
-	if (C.authors) {
-	  var a = (author || '');
-	  var lastAuthorPtr = C.authors.length-1;
-	  var lastAuthorLengthPtr = C.authors.length-2;
-	  if ((!a) || a == C.authors[lastAuthorPtr]) {
-	    C.authors[lastAuthorLengthPtr] += str.length;
-	  }
-	  else if (0 == C.authors[lastAuthorLengthPtr]) {
-	    C.authors[lastAuthorLengthPtr] = str.length;
-	    C.authors[lastAuthorPtr] = (a || C.authors[lastAuthorPtr]);
-	  }
-	  else {
-	    C.authors.push(str.length, a);
-	  }
-	}
-
-	return self;
-      },
-      appendOldText: function(startIndex, numTaken) {
-	if (numTaken == 0) return self;
-	// properties of last strip...
-	var s = C[C.length-3], t = C[C.length-2], n = C[C.length-1];
-	if (t == 0 && n == "") {
-	  // must be empty changeset, one strip that doesn't take old chars or add new ones
-	  C[C.length-3] = startIndex;
-	  C[C.length-2] = numTaken;
-	}
-	else if (n == "" && (s+t == startIndex)) {
-	  C[C.length-2] += numTaken; // take more
-	}
-	else C.push(startIndex, numTaken, ""); // add a strip
-	C[2] += numTaken;
-	C.checkRep();
-	return self;
-      },
-      toChangeset: function() { return C; }
-    };
-  }
-
-  array.authorSlicer = function(outputBuilder) {
-    return _makeAuthorSlicer(this, outputBuilder);
-  }
-
-  function _makeAuthorSlicer(changesetOrAuthorsIn, builderOut) {
-    // "builderOut" only needs to support appendNewText
-    var authors; // considered immutable
-    if (changesetOrAuthorsIn.isChangeset) {
-      authors = changesetOrAuthorsIn.authors;
-    }
-    else {
-      authors = changesetOrAuthorsIn;
-    }
-
-    // OOP style: state in environment
-    var authorPtr = 0;
-    var charIndex = 0;
-    var charWithinAuthor = 0; // 0 <= charWithinAuthor <= authors[authorPtr];  max value iff atEnd
-    var atEnd = false;
-    function curAuthor() { return authors[authorPtr+1]; }
-    function curAuthorWidth() { return authors[authorPtr]; }
-    function assertNotAtEnd() { assert(! atEnd, "_authorSlicer: can't move past end"); }
-    function forwardInAuthor(numChars) {
-      charWithinAuthor += numChars;
-      charIndex += numChars;
-    }
-    function nextAuthor() {
-      assertNotAtEnd();
-      assert(charWithinAuthor == curAuthorWidth(), "_authorSlicer: not at author end");
-      charWithinAuthor = 0;
-      authorPtr += 2;
-      if (authorPtr == authors.length) {
-	atEnd = true;
-      }
-    }
-
-    var self;
-    return self = {
-      skipChars: function(n) {
-	assert(n >= 0, "_authorSlicer: can't skip negative n");
-	if (n == 0) return;
-	assertNotAtEnd();
-
-	var leftToSkip = n;
-	while (leftToSkip > 0) {
-	  var leftInAuthor = curAuthorWidth() - charWithinAuthor;
-	  if (leftToSkip >= leftInAuthor) {
-	    forwardInAuthor(leftInAuthor);
-	    leftToSkip -= leftInAuthor;
-	    nextAuthor();
-	  }
-	  else {
-	    forwardInAuthor(leftToSkip);
-	    leftToSkip = 0;
-	  }
-	}
-      },
-      takeChars: function(n, text) {
-	assert(n >= 0, "_authorSlicer: can't take negative n");
-	if (n == 0) return;
-	assertNotAtEnd();
-	assert(n == text.length, "_authorSlicer: bad text length");
-
-	var textLeft = text;
-	var leftToTake = n;
-	while (leftToTake > 0) {
-	  if (curAuthorWidth() > 0 && charWithinAuthor < curAuthorWidth()) {
-	    // at least one char to take from current author
-	    var leftInAuthor = (curAuthorWidth() - charWithinAuthor);
-	    assert(leftInAuthor > 0, "_authorSlicer: should have leftInAuthor > 0");
-	    var toTake = min(leftInAuthor, leftToTake);
-	    assert(toTake > 0, "_authorSlicer: should have toTake > 0");
-	    builderOut.appendNewText(textLeft.substring(0, toTake), curAuthor());
-	    forwardInAuthor(toTake);
-	    leftToTake -= toTake;
-	    textLeft = textLeft.substring(toTake);
-	  }
-	  assert(charWithinAuthor <= curAuthorWidth(), "_authorSlicer: past end of author");
-	  if (charWithinAuthor == curAuthorWidth()) {
-	    nextAuthor();
-	  }
-	}
-      },
-      setBuilder: function(builder) {
-	builderOut = builder;
-      }
-    };
-  }
-
-  function _makeSlicer(C, output) {
-    // C: Changeset, output: builder from _makeBuilder
-    // C is considered immutable, won't change or be changed
-
-    // OOP style: state in environment
-    var charIndex = 0; // 0 <= charIndex <= C.newLen();  maximum value iff atEnd
-    var stripIndex = 0; // 0 <= stripIndex <= C.numStrips();  maximum value iff atEnd
-    var charWithinStrip = 0; // 0 <= charWithinStrip < curStripWidth()
-    var atEnd = false;
-
-    var authorSlicer;
-    if (C.authors) {
-      authorSlicer = _makeAuthorSlicer(C.authors, output);
-    }
-
-    var ptr = 3;
-    function curStartIndex() { return C[ptr]; }
-    function curNumTaken() { return C[ptr+1]; }
-    function curNewText() { return C[ptr+2]; }
-    function curStripWidth() { return curNumTaken() + curNewText().length; }
-    function assertNotAtEnd() { assert(! atEnd, "_slicer: can't move past changeset end"); }
-    function forwardInStrip(numChars) {
-      charWithinStrip += numChars;
-      charIndex += numChars;
-    }
-    function nextStrip() {
-      assertNotAtEnd();
-      assert(charWithinStrip == curStripWidth(), "_slicer: not at strip end");
-      charWithinStrip = 0;
-      stripIndex++;
-      ptr += 3;
-      if (stripIndex == C.numStrips()) {
-	atEnd = true;
-      }
-    }
-    function curNumNewCharsInRange(start, end) {
-      // takes two indices into the current strip's combined "taken" and "new"
-      // chars, and returns how many "new" chars are included in the range
-      assert(start <= end, "_slicer: curNumNewCharsInRange given out-of-order indices");
-      var nt = curNumTaken();
-      var nn = curNewText().length;
-      var s = nt;
-      var e = nt+nn;
-      if (s < start) s = start;
-      if (e > end) e = end;
-      if (e < s) return 0;
-      return e-s;
-    }
-
-    var self;
-    return self = {
-      skipChars: function (n) {
-	assert(n >= 0, "_slicer: can't skip negative n");
-	if (n == 0) return;
-	assertNotAtEnd();
-
-	var leftToSkip = n;
-	while (leftToSkip > 0) {
-	  var leftInStrip = curStripWidth() - charWithinStrip;
-	  if (leftToSkip >= leftInStrip) {
-	    forwardInStrip(leftInStrip);
-
-	    if (authorSlicer)
-	      authorSlicer.skipChars(curNumNewCharsInRange(charWithinStrip,
-							   charWithinStrip + leftInStrip));
-
-	    leftToSkip -= leftInStrip;
-	    nextStrip();
-	  }
-	  else {
-	    if (authorSlicer)
-	      authorSlicer.skipChars(curNumNewCharsInRange(charWithinStrip,
-							   charWithinStrip + leftToSkip));
-
-	    forwardInStrip(leftToSkip);
-	    leftToSkip = 0;
-	  }
-	}
-      },
-      takeChars: function (n) {
-	assert(n >= 0, "_slicer: can't take negative n");
-	if (n == 0) return;
-	assertNotAtEnd();
-
-	var leftToTake = n;
-	while (leftToTake > 0) {
-	  if (curNumTaken() > 0 && charWithinStrip < curNumTaken()) {
-	    // at least one char to take from current strip's numTaken
-	    var leftInTaken = (curNumTaken() - charWithinStrip);
-	    assert(leftInTaken > 0, "_slicer: should have leftInTaken > 0");
-	    var toTake = min(leftInTaken, leftToTake);
-	    assert(toTake > 0, "_slicer: should have toTake > 0");
-	    output.appendOldText(curStartIndex() + charWithinStrip, toTake);
-	    forwardInStrip(toTake);
-	    leftToTake -= toTake;
-	  }
-	  if (leftToTake > 0 && curNewText().length > 0 && charWithinStrip >= curNumTaken() &&
-	      charWithinStrip < curStripWidth()) {
-	    // at least one char to take from current strip's newText
-	    var leftInNewText = (curStripWidth() - charWithinStrip);
-	    assert(leftInNewText > 0, "_slicer: should have leftInNewText > 0");
-	    var toTake = min(leftInNewText, leftToTake);
-	    assert(toTake > 0, "_slicer: should have toTake > 0");
-	    var newText = curNewText().substr(charWithinStrip - curNumTaken(), toTake);
-	    if (authorSlicer) {
-	      authorSlicer.takeChars(newText.length, newText);
-	    }
-	    else {
-	      output.appendNewText(newText);
-	    }
-	    forwardInStrip(toTake);
-	    leftToTake -= toTake;
-	  }
-	  assert(charWithinStrip <= curStripWidth(), "_slicer: past end of strip");
-	  if (charWithinStrip == curStripWidth()) {
-	    nextStrip();
-	  }
-	}
-      },
-      skipTo: function(n) {
-	self.skipChars(n - charIndex);
-      }
-    };
-  }
-
-  array.slicer = function(outputBuilder) {
-    return _makeSlicer(this, outputBuilder);
-  }
-
-  array.compose = function(next) {
-    assert(next.oldLen() == this.newLen(), "mismatched composition");
-
-    var builder = _makeBuilder(this.oldLen(), !!(this.authors || next.authors));
-    var slicer = _makeSlicer(this, builder);
-
-    var authorSlicer;
-    if (next.authors) {
-      authorSlicer = _makeAuthorSlicer(next.authors, builder);
-    }
-
-    next.eachStrip(function(s, t, n) {
-      slicer.skipTo(s);
-      slicer.takeChars(t);
-      if (authorSlicer) {
-	authorSlicer.takeChars(n.length, n);
-      }
-      else {
-	builder.appendNewText(n);
-      }
-    }, this);
-
-    return builder.toChangeset();
-  };
-
-  array.traverser = function() {
-    return _makeTraverser(this);
-  }
-
-  function _makeTraverser(C) {
-    var s = C[3], t = C[4], n = C[5];
-    var nextIndex = 6;
-    var indexIntoNewText = 0;
-
-    var authorSlicer;
-    if (C.authors) {
-      authorSlicer = _makeAuthorSlicer(C.authors, null);
-    }
-
-    function advanceIfPossible() {
-      if (t == 0 && n == "" && nextIndex < C.length) {
-	s = C[nextIndex];
-	t = C[nextIndex+1];
-	n = C[nextIndex+2];
-	nextIndex += 3;
-      }
-    }
-
-    var self;
-    return self = {
-      numTakenChars: function() {
-	// if starts with taken characters, then how many, else 0
-	return (t > 0) ? t : 0;
-      },
-      numNewChars: function() {
-	// if starts with new characters, then how many, else 0
-	return (t == 0 && n.length > 0) ? n.length : 0;
-      },
-      takenCharsStart: function() {
-	return (self.numTakenChars() > 0) ? s : 0;
-      },
-      hasMore: function() {
-	return self.numTakenChars() > 0 || self.numNewChars() > 0;
-      },
-      curIndex: function() {
-	return indexIntoNewText;
-      },
-      consumeTakenChars: function (x) {
-	assert(self.numTakenChars() > 0, "_traverser: no taken chars");
-	assert(x >= 0 && x <= self.numTakenChars(), "_traverser: bad number of taken chars");
-	if (x == 0) return;
-	if (t == x) { s = 0;  t = 0; }
-	else { s += x;  t -= x; }
-	indexIntoNewText += x;
-	advanceIfPossible();
-      },
-      consumeNewChars: function(x) {
-	return self.appendNewChars(x, null);
-      },
-      appendNewChars: function(x, builder) {
-	assert(self.numNewChars() > 0, "_traverser: no new chars");
-	assert(x >= 0 && x <= self.numNewChars(), "_traverser: bad number of new chars");
-	if (x == 0) return "";
-	var str = n.substring(0, x);
-	n = n.substring(x);
-	indexIntoNewText += x;
-	advanceIfPossible();
-
-	if (builder) {
-	  if (authorSlicer) {
-	    authorSlicer.setBuilder(builder);
-	    authorSlicer.takeChars(x, str);
-	  }
-	  else {
-	    builder.appendNewText(str);
-	  }
-	}
-	else {
-	  if (authorSlicer) authorSlicer.skipChars(x);
-	  return str;
-	}
-      },
-      consumeAvailableTakenChars: function() {
-	return self.consumeTakenChars(self.numTakenChars());
-      },
-      consumeAvailableNewChars: function() {
-	return self.consumeNewChars(self.numNewChars());
-      },
-      appendAvailableNewChars: function(builder) {
-	return self.appendNewChars(self.numNewChars(), builder);
-      }
-    };
-  }
-
-  array.follow = function(prev, reverseInsertOrder) {
-    // prev: Changeset, reverseInsertOrder: boolean
-
-    // A.compose(B.follow(A)) is the merging of Changesets A and B, which operate on the same old text.
-    // It is always the same as B.compose(A.follow(B, true)).
-
-    assert(prev.oldLen() == this.oldLen(), "mismatched follow: "+prev.oldLen()+"/"+this.oldLen());
-    var builder = _makeBuilder(prev.newLen(), !! this.authors);
-    var a = _makeTraverser(prev);
-    var b = _makeTraverser(this);
-    while (a.hasMore() || b.hasMore()) {
-      if (a.numNewChars() > 0 && ! reverseInsertOrder) {
-	builder.appendOldText(a.curIndex(), a.numNewChars());
-	a.consumeAvailableNewChars();
-      }
-      else if (b.numNewChars() > 0) {
-	b.appendAvailableNewChars(builder);
-      }
-      else if (a.numNewChars() > 0 && reverseInsertOrder) {
-	builder.appendOldText(a.curIndex(), a.numNewChars());
-	a.consumeAvailableNewChars();
-      }
-      else if (! b.hasMore()) a.consumeAvailableTakenChars();
-      else if (! a.hasMore()) b.consumeAvailableTakenChars();
-      else {
-	var x = a.takenCharsStart();
-	var y = b.takenCharsStart();
-	if (x < y) a.consumeTakenChars(min(a.numTakenChars(), y-x));
-	else if (y < x) b.consumeTakenChars(min(b.numTakenChars(), x-y));
-	else {
-	  var takenByBoth = min(a.numTakenChars(), b.numTakenChars());
-	  builder.appendOldText(a.curIndex(), takenByBoth);
-	  a.consumeTakenChars(takenByBoth);
-	  b.consumeTakenChars(takenByBoth);
-	}
-      }
-    }
-    return builder.toChangeset();
-  }
-
-  array.encodeToString = function(asBinary) {
-    var stringDataArray = [];
-    var numsArray = [];
-    if (! asBinary) numsArray.push(this[0]);
-    numsArray.push(this[1], this[2]);
-    this.eachStrip(function(s, t, n) {
-      numsArray.push(s, t, n.length);
-      stringDataArray.push(n);
-    }, this);
-    if (! asBinary) {
-      return numsArray.join(',')+'|'+stringDataArray.join('');
-    }
-    else {
-      return "A" + Changeset.numberArrayToString(numsArray)
-	+escapeCrazyUnicode(stringDataArray.join(''));
-    }
-  }
-
-  function escapeCrazyUnicode(str) {
-    return str.replace(/\\/g, '\\\\').replace(/[\ud800-\udfff]/g, function (c) {
-      return "\\u"+("0000"+c.charCodeAt(0).toString(16)).slice(-4);
-    });
-  }
-
-  array.applyToAttributedText = Changeset.applyToAttributedText;
-
-  function splicesFromChanges(c) {
-    var splices = [];
-    // get a list of splices, [startChar, endChar, newText]
-    var traverser = c.traverser();
-    var oldTextLength = c.oldLen();
-    var indexIntoOldText = 0;
-    while (traverser.hasMore() || indexIntoOldText < oldTextLength) {
-      var newText = "";
-      var startChar = indexIntoOldText;
-      var endChar = indexIntoOldText;
-      if (traverser.numNewChars() > 0) {
-	newText = traverser.consumeAvailableNewChars();
-      }
-      if (traverser.hasMore()) {
-	endChar = traverser.takenCharsStart();
-	indexIntoOldText = endChar + traverser.numTakenChars();
-	traverser.consumeAvailableTakenChars();
-      }
-      else {
-	endChar = oldTextLength;
-	indexIntoOldText = endChar;
-      }
-      if (endChar != startChar || newText.length > 0) {
-	splices.push([startChar, endChar, newText]);
-      }
-    }
-    return splices;
-  }
-
-  array.toSplices = function() {
-    return splicesFromChanges(this);
-  }
-
-  array.characterRangeFollowThis = function(selStartChar, selEndChar, insertionsAfter) {
-    var changeset = this;
-    // represent the selection as a changeset that replaces the selection with some finite string.
-    // Because insertions indicate intention, it doesn't matter what this string is, and even
-    // if the selectionChangeset is made to "follow" other changes it will still be the only
-    // insertion.
-    var selectionChangeset =
-      Changeset(changeset.oldLen()).builder().appendOldText(0, selStartChar).appendNewText(
-	"X").appendOldText(selEndChar, changeset.oldLen() - selEndChar).toChangeset();
-    var newSelectionChangeset = selectionChangeset.follow(changeset, insertionsAfter);
-    var selectionSplices = newSelectionChangeset.toSplices();
-    function includeChar(i) {
-      if (! includeChar.calledYet) {
-	selStartChar = i;
-	selEndChar = i;
-	includeChar.calledYet = true;
-      }
-      else {
-	if (i < selStartChar) selStartChar = i;
-	if (i > selEndChar) selEndChar = i;
-      }
-    }
-    for(var i=0; i<selectionSplices.length; i++) {
-      var s = selectionSplices[i];
-      includeChar(s[0]);
-      includeChar(s[1]);
-    }
-    return [selStartChar, selEndChar];
-  }
-
-  return array;
-}
-
-Changeset.MAGIC = "Changeset";
-Changeset.makeSplice = function(oldLength, spliceStart, numRemoved, stringInserted) {
-  oldLength = (oldLength || 0);
-  spliceStart = (spliceStart || 0);
-  numRemoved = (numRemoved || 0);
-  stringInserted = String(stringInserted || "");
-
-  var builder = Changeset(oldLength).builder();
-  builder.appendOldText(0, spliceStart);
-  builder.appendNewText(stringInserted);
-  builder.appendOldText(spliceStart + numRemoved, oldLength - numRemoved - spliceStart);
-  return builder.toChangeset();
-};
-Changeset.identity = function(len) {
-  return Changeset(len).builder().appendOldText(0, len).toChangeset();
-};
-Changeset.decodeFromString = function(str) {
-  function error(msg) { var e = new Error(msg); e.easysync = true; throw e; }
-  function toHex(str) {
-    var a = [];
-    a.push("length["+str.length+"]:");
-    var TRUNC=20;
-    for(var i=0;i<str.substring(0,TRUNC).length;i++) {
-      a.push(("000"+str.charCodeAt(i).toString(16)).slice(-4));
-    }
-    if (str.length > TRUNC) a.push("...");
-    return a.join(' ');
-  }
-  function unescapeCrazyUnicode(str) {
-    return str.replace(/\\(u....|\\)/g, function(seq) {
-      if (seq == "\\\\") return "\\";
-      return String.fromCharCode(Number("0x"+seq.substring(2)));
-    });
-  }
-
-  var numData, stringData;
-  var binary = false;
-  var typ = str.charAt(0);
-  if (typ == "B" || typ == "A") {
-    var result = Changeset.numberArrayFromString(str, 1);
-    numData = result[0];
-    stringData = result[1];
-    if (typ == "A") {
-      stringData = unescapeCrazyUnicode(stringData);
-    }
-    binary = true;
-  }
-  else if (typ == "C") {
-    var barPosition = str.indexOf('|');
-    numData = str.substring(0, barPosition).split(',');
-    stringData = str.substring(barPosition+1);
-  }
-  else {
-    error("Not a changeset: "+toHex(str));
-  }
-  var stringDataOffset = 0;
-  var array = [];
-  var ptr;
-  if (binary) {
-    array.push("Changeset", numData[0], numData[1]);
-    var ptr = 2;
-  }
-  else {
-    array.push(numData[0], Number(numData[1]), Number(numData[2]));
-    var ptr = 3;
-  }
-  while (ptr < numData.length) {
-    array.push(Number(numData[ptr++]), Number(numData[ptr++]));
-    var newTextLength = Number(numData[ptr++]);
-    array.push(stringData.substr(stringDataOffset, newTextLength));
-    stringDataOffset += newTextLength;
-  }
-  if (stringDataOffset != stringData.length) {
-    error("Extra character data beyond end of encoded string ("+toHex(str)+")");
-  }
-  return Changeset(array);
-};
-
-Changeset.numberArrayToString = function(nums) {
-  var array = [];
-  function writeNum(n) {
-    // does not support negative numbers
-    var twentyEightBit = (n & 0xfffffff);
-    if (twentyEightBit <= 0x7fff) {
-      array.push(String.fromCharCode(twentyEightBit));
-    }
-    else {
-      array.push(String.fromCharCode(0xa000 | (twentyEightBit >> 15),
-				     twentyEightBit & 0x7fff));
-    }
-  }
-  writeNum(nums.length);
-  var len = nums.length;
-  for(var i=0;i<len;i++) {
-    writeNum(nums[i]);
-  }
-  return array.join('');
-};
-
-Changeset.numberArrayFromString = function(str, startIndex) {
-  // returns [numberArray, remainingString]
-  var nums = [];
-  var strIndex = (startIndex || 0);
-  function readNum() {
-    var n = str.charCodeAt(strIndex++);
-    if (n > 0x7fff) {
-      if (n >= 0xa000) {
-	n = (((n & 0x1fff) << 15) | str.charCodeAt(strIndex++));
-      }
-      else {
-	// legacy format
-	n = (((n & 0x1fff) << 16) | str.charCodeAt(strIndex++));
-      }
-    }
-    return n;
-  }
-  var len = readNum();
-  for(var i=0;i<len;i++) {
-    nums.push(readNum());
-  }
-  return [nums, str.substring(strIndex)];
-};
-
-(function() {
-  function repeatString(str, times) {
-    if (times <= 0) return "";
-    var s = repeatString(str, times >> 1);
-    s += s;
-    if (times & 1) s += str;
-    return s;
-  }
-  function chr(n) { return String.fromCharCode(n+48); }
-  function ord(c) { return c.charCodeAt(0)-48; }
-  function runMatcher(c) {
-    // Takes "A" and returns /\u0041+/g .
-    // Avoid creating new objects unnecessarily by caching matchers
-    // as properties of this function.
-    var re = runMatcher[c];
-    if (re) return re;
-    re = runMatcher[c] = new RegExp("\\u"+("0000"+c.charCodeAt(0).toString(16)).slice(-4)+"+", 'g');
-    return re;
-  }
-  function runLength(str, idx, c) {
-    var re = runMatcher(c);
-    re.lastIndex = idx;
-    var result = re.exec(str);
-    if (result && result[0]) {
-      return result[0].length;
-    }
-    return 0;
-  }
-
-  // emptyObj may be a StorableObject
-  Changeset.initAttributedText = function(emptyObj, initialString, initialAuthor) {
-    var obj = emptyObj;
-    obj.authorMap = { 1: (initialAuthor || '') };
-    obj.text = (initialString || '');
-    obj.attribs = repeatString(chr(1), obj.text.length);
-    return obj;
-  };
-  Changeset.gcAttributedText = function(atObj) {
-    // "garbage collect" the list of authors
-    var removedAuthors = [];
-    for(var a in atObj.authorMap) {
-      if (atObj.attribs.indexOf(chr(Number(a))) < 0) {
-	removedAuthors.push(atObj.authorMap[a]);
-	delete atObj.authorMap[a];
-      }
-    }
-    return removedAuthors;
-  };
-  Changeset.cloneAttributedText = function(emptyObj, atObj) {
-    var obj = emptyObj;
-    obj.text = atObj.text; // string
-    if (atObj.attribs) obj.attribs = atObj.attribs; // string
-    if (atObj.attribs_c) obj.attribs_c = atObj.attribs_c; // string
-    obj.authorMap = {};
-    for(var a in atObj.authorMap) {
-      obj.authorMap[a] = atObj.authorMap[a];
-    }
-    return obj;
-  };
-  Changeset.applyToAttributedText = function(atObj, C) {
-    C = (C || this);
-    var oldText = atObj.text;
-    var oldAttribs = atObj.attribs;
-    Changeset._assert(C.isChangeset, "applyToAttributedText: 'this' is not a changeset");
-    Changeset._assert(oldText.length == C.oldLen(),
-		      "applyToAttributedText: mismatch "+oldText.length+" / "+C.oldLen());
-    var textBuf = [];
-    var attribsBuf = [];
-    var authorMap = atObj.authorMap;
-    function authorId(author) {
-      for(var a in authorMap) {
-	if (authorMap[Number(a)] === author) {
-	  return Number(a);
-	}
-      }
-      for(var i=1;i<=60000;i++) {
-	// don't use "in" because it's currently broken on StorableObjects
-	if (authorMap[i] === undefined) {
-	  authorMap[i] = author;
-	  return i;
-	}
-      }
-    }
-    var myBuilder = { appendNewText: function(txt, author) {
-      // object that acts as a "builder" in that it receives requests from
-      // authorSlicer to append text attributed to different authors
-      attribsBuf.push(repeatString(chr(authorId(author)), txt.length));
-    } };
-    var authorSlicer;
-    if (C.authors) {
-      authorSlicer = C.authorSlicer(myBuilder);
-    }
-    C.eachStrip(function (s, t, n) {
-      textBuf.push(oldText.substr(s, t), n);
-      attribsBuf.push(oldAttribs.substr(s, t));
-      if (authorSlicer) {
-	authorSlicer.takeChars(n.length, n);
-      }
-      else {
-	myBuilder.appendNewText(n, '');
-      }
-    });
-    atObj.text = textBuf.join('');
-    atObj.attribs = attribsBuf.join('');
-    return atObj;
-  };
-  Changeset.getAttributedTextCharAuthor = function(atObj, idx) {
-    return atObj.authorMap[ord(atObj.attribs.charAt(idx))];
-  };
-  Changeset.getAttributedTextCharRunLength = function(atObj, idx) {
-    var c = atObj.attribs.charAt(idx);
-    return runLength(atObj.attribs, idx, c);
-  };
-  Changeset.eachAuthorInAttributedText = function(atObj, func) {
-    // call func(author, authorNum)
-    for(var a in atObj.authorMap) {
-      if (func(atObj.authorMap[a], Number(a))) break;
-    }
-  };
-  Changeset.getAttributedTextAuthorByNum = function(atObj, n) {
-    return atObj.authorMap[n];
-  };
-  // Compressed attributed text can be cloned, but nothing else until uncompressed!!
-  Changeset.compressAttributedText = function(atObj) {
-    // idempotent, mutates the object, returns it
-    if (atObj.attribs) {
-      atObj.attribs_c = atObj.attribs.replace(/([\s\S])\1{0,63}/g, function(run) {
-	return run.charAt(0)+chr(run.length);;
-      });
-      delete atObj.attribs;
-    }
-    return atObj;
-  };
-  Changeset.decompressAttributedText = function(atObj) {
-    // idempotent, mutates the object, returns it
-    if (atObj.attribs_c) {
-      atObj.attribs = atObj.attribs_c.replace(/[\s\S][\s\S]/g, function(run) {
-	return repeatString(run.charAt(0), ord(run.charAt(1)));
-      });
-      delete atObj.attribs_c;
-    }
-    return atObj;
-  };
-})();
diff --git a/etherpad/src/etherpad/collab/ace/easysync2.js b/etherpad/src/etherpad/collab/ace/easysync2.js
deleted file mode 100644
index 0fa1ec4..0000000
--- a/etherpad/src/etherpad/collab/ace/easysync2.js
+++ /dev/null
@@ -1,1968 +0,0 @@
-// DO NOT EDIT THIS FILE, edit infrastructure/ace/www/easysync2.js
-jimport("com.etherpad.Easysync2Support");
-
-/**
- * Copyright 2009 Google Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS-IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-//var _opt = (this.Easysync2Support || null);
-var _opt = null; // disable optimization for now
-
-function AttribPool() {
-  var p = {};
-  p.numToAttrib = {}; // e.g. {0: ['foo','bar']}
-  p.attribToNum = {}; // e.g. {'foo,bar': 0}
-  p.nextNum = 0;
-
-  p.putAttrib = function(attrib, dontAddIfAbsent) {
-    var str = String(attrib);
-    if (str in p.attribToNum) {
-      return p.attribToNum[str];
-    }
-    if (dontAddIfAbsent) {
-      return -1;
-    }
-    var num = p.nextNum++;
-    p.attribToNum[str] = num;
-    p.numToAttrib[num] = [String(attrib[0]||''),
-			  String(attrib[1]||'')];
-    return num;
-  };
-
-  p.getAttrib = function(num) {
-    var pair = p.numToAttrib[num];
-    if (! pair) return pair;
-    return [pair[0], pair[1]]; // return a mutable copy
-  };
-
-  p.getAttribKey = function(num) {
-    var pair = p.numToAttrib[num];
-    if (! pair) return '';
-    return pair[0];
-  };
-
-  p.getAttribValue = function(num) {
-    var pair = p.numToAttrib[num];
-    if (! pair) return '';
-    return pair[1];
-  };
-
-  p.eachAttrib = function(func) {
-    for(var n in p.numToAttrib) {
-      var pair = p.numToAttrib[n];
-      func(pair[0], pair[1]);
-    }
-  };
-
-  p.toJsonable = function() {
-    return {numToAttrib: p.numToAttrib, nextNum: p.nextNum};
-  };
-
-  p.fromJsonable = function(obj) {
-    p.numToAttrib = obj.numToAttrib;
-    p.nextNum = obj.nextNum;
-    p.attribToNum = {};
-    for(var n in p.numToAttrib) {
-      p.attribToNum[String(p.numToAttrib[n])] = Number(n);
-    }
-    return p;
-  };
-
-  return p;
-}
-
-var Changeset = {};
-
-Changeset.error = function error(msg) { var e = new Error(msg); e.easysync = true; throw e; };
-Changeset.assert = function assert(b, msgParts) {
-  if (! b) {
-    var msg = Array.prototype.slice.call(arguments, 1).join('');
-    Changeset.error("Changeset: "+msg);
-  }
-};
-
-Changeset.parseNum = function(str) { return parseInt(str, 36); };
-Changeset.numToString = function(num) { return num.toString(36).toLowerCase(); };
-Changeset.toBaseTen = function(cs) {
-  var dollarIndex = cs.indexOf('$');
-  var beforeDollar = cs.substring(0, dollarIndex);
-  var fromDollar = cs.substring(dollarIndex);
-  return beforeDollar.replace(/[0-9a-z]+/g, function(s) {
-    return String(Changeset.parseNum(s)); }) + fromDollar;
-};
-
-Changeset.oldLen = function(cs) {
-  return Changeset.unpack(cs).oldLen;
-};
-Changeset.newLen = function(cs) {
-  return Changeset.unpack(cs).newLen;
-};
-
-Changeset.opIterator = function(opsStr, optStartIndex) {
-  //print(opsStr);
-  var regex = /((?:\*[0-9a-z]+)*)(?:\|([0-9a-z]+))?([-+=])([0-9a-z]+)|\?|/g;
-  var startIndex = (optStartIndex || 0);
-  var curIndex = startIndex;
-  var prevIndex = curIndex;
-  function nextRegexMatch() {
-    prevIndex = curIndex;
-    var result;
-    if (_opt) {
-      result = _opt.nextOpInString(opsStr, curIndex);
-      if (result) {
-        if (result.opcode() == '?') {
-          Changeset.error("Hit error opcode in op stream");
-        }
-        curIndex = result.lastIndex();
-      }
-    }
-    else {
-      regex.lastIndex = curIndex;
-      result = regex.exec(opsStr);
-      curIndex = regex.lastIndex;
-      if (result[0] == '?') {
-        Changeset.error("Hit error opcode in op stream");
-      }
-    }
-    return result;
-  }
-  var regexResult = nextRegexMatch();
-  var obj = Changeset.newOp();
-  function next(optObj) {
-    var op = (optObj || obj);
-    if (_opt && regexResult) {
-      op.attribs = regexResult.attribs();
-      op.lines = regexResult.lines();
-      op.chars = regexResult.chars();
-      op.opcode = regexResult.opcode();
-      regexResult = nextRegexMatch();
-    }
-    else if ((! _opt) && regexResult[0]) {
-      op.attribs = regexResult[1];
-      op.lines = Changeset.parseNum(regexResult[2] || 0);
-      op.opcode = regexResult[3];
-      op.chars = Changeset.parseNum(regexResult[4]);
-      regexResult = nextRegexMatch();
-    }
-    else {
-      Changeset.clearOp(op);
-    }
-    return op;
-  }
-  function hasNext() { return !! (_opt ? regexResult : regexResult[0]); }
-  function lastIndex() { return prevIndex; }
-  return {next: next, hasNext: hasNext, lastIndex: lastIndex};
-};
-
-Changeset.clearOp = function(op) {
-  op.opcode = '';
-  op.chars = 0;
-  op.lines = 0;
-  op.attribs = '';
-};
-Changeset.newOp = function(optOpcode) {
-  return {opcode:(optOpcode || ''), chars:0, lines:0, attribs:''};
-};
-Changeset.cloneOp = function(op) {
-  return {opcode: op.opcode, chars: op.chars, lines: op.lines, attribs: op.attribs};
-};
-Changeset.copyOp = function(op1, op2) {
-  op2.opcode = op1.opcode;
-  op2.chars = op1.chars;
-  op2.lines = op1.lines;
-  op2.attribs = op1.attribs;
-};
-Changeset.opString = function(op) {
-  // just for debugging
-  if (! op.opcode) return 'null';
-  var assem = Changeset.opAssembler();
-  assem.append(op);
-  return assem.toString();
-};
-Changeset.stringOp = function(str) {
-  // just for debugging
-  return Changeset.opIterator(str).next();
-};
-
-Changeset.checkRep = function(cs) {
-  // doesn't check things that require access to attrib pool (e.g. attribute order)
-  // or original string (e.g. newline positions)
-  var unpacked = Changeset.unpack(cs);
-  var oldLen = unpacked.oldLen;
-  var newLen = unpacked.newLen;
-  var ops = unpacked.ops;
-  var charBank = unpacked.charBank;
-
-  var assem = Changeset.smartOpAssembler();
-  var oldPos = 0;
-  var calcNewLen = 0;
-  var numInserted = 0;
-  var iter = Changeset.opIterator(ops);
-  while (iter.hasNext()) {
-    var o = iter.next();
-    switch (o.opcode) {
-    case '=': oldPos += o.chars; calcNewLen += o.chars; break;
-    case '-': oldPos += o.chars; Changeset.assert(oldPos < oldLen, oldPos," >= ",oldLen," in ",cs); break;
-    case '+': {
-      calcNewLen += o.chars; numInserted += o.chars;
-      Changeset.assert(calcNewLen < newLen, calcNewLen," >= ",newLen," in ",cs);
-      break;
-    }
-    }
-    assem.append(o);
-  }
-
-  calcNewLen += oldLen - oldPos;
-  charBank = charBank.substring(0, numInserted);
-  while (charBank.length < numInserted) {
-    charBank += "?";
-  }
-
-  assem.endDocument();
-  var normalized = Changeset.pack(oldLen, calcNewLen, assem.toString(), charBank);
-  Changeset.assert(normalized == cs, normalized,' != ',cs);
-
-  return cs;
-}
-
-Changeset.smartOpAssembler = function() {
-  // Like opAssembler but able to produce conforming changesets
-  // from slightly looser input, at the cost of speed.
-  // Specifically:
-  // - merges consecutive operations that can be merged
-  // - strips final "="
-  // - ignores 0-length changes
-  // - reorders consecutive + and - (which margingOpAssembler doesn't do)
-
-  var minusAssem = Changeset.mergingOpAssembler();
-  var plusAssem = Changeset.mergingOpAssembler();
-  var keepAssem = Changeset.mergingOpAssembler();
-  var assem = Changeset.stringAssembler();
-  var lastOpcode = '';
-  var lengthChange = 0;
-
-  function flushKeeps() {
-    assem.append(keepAssem.toString());
-    keepAssem.clear();
-  }
-
-  function flushPlusMinus() {
-    assem.append(minusAssem.toString());
-    minusAssem.clear();
-    assem.append(plusAssem.toString());
-    plusAssem.clear();
-  }
-
-  function append(op) {
-    if (! op.opcode) return;
-    if (! op.chars) return;
-
-    if (op.opcode == '-') {
-      if (lastOpcode == '=') {
-	flushKeeps();
-      }
-      minusAssem.append(op);
-      lengthChange -= op.chars;
-    }
-    else if (op.opcode == '+') {
-      if (lastOpcode == '=') {
-	flushKeeps();
-      }
-      plusAssem.append(op);
-      lengthChange += op.chars;
-    }
-    else if (op.opcode == '=') {
-      if (lastOpcode != '=') {
-	flushPlusMinus();
-      }
-      keepAssem.append(op);
-    }
-    lastOpcode = op.opcode;
-  }
-
-  function appendOpWithText(opcode, text, attribs, pool) {
-    var op = Changeset.newOp(opcode);
-    op.attribs = Changeset.makeAttribsString(opcode, attribs, pool);
-    var lastNewlinePos = text.lastIndexOf('\n');
-    if (lastNewlinePos < 0) {
-      op.chars = text.length;
-      op.lines = 0;
-      append(op);
-    }
-    else {
-      op.chars = lastNewlinePos+1;
-      op.lines = text.match(/\n/g).length;
-      append(op);
-      op.chars = text.length - (lastNewlinePos+1);
-      op.lines = 0;
-      append(op);
-    }
-  }
-
-  function toString() {
-    flushPlusMinus();
-    flushKeeps();
-    return assem.toString();
-  }
-
-  function clear() {
-    minusAssem.clear();
-    plusAssem.clear();
-    keepAssem.clear();
-    assem.clear();
-    lengthChange = 0;
-  }
-
-  function endDocument() {
-    keepAssem.endDocument();
-  }
-
-  function getLengthChange() {
-    return lengthChange;
-  }
-
-  return {append: append, toString: toString, clear: clear, endDocument: endDocument,
-	  appendOpWithText: appendOpWithText, getLengthChange: getLengthChange };
-};
-
-if (_opt) {
-  Changeset.mergingOpAssembler = function() {
-    var assem = _opt.mergingOpAssembler();
-
-    function append(op) {
-      assem.append(op.opcode, op.chars, op.lines, op.attribs);
-    }
-    function toString() {
-      return assem.toString();
-    }
-    function clear() {
-      assem.clear();
-    }
-    function endDocument() {
-      assem.endDocument();
-    }
-
-    return {append: append, toString: toString, clear: clear, endDocument: endDocument};
-  };
-}
-else {
-  Changeset.mergingOpAssembler = function() {
-    // This assembler can be used in production; it efficiently
-    // merges consecutive operations that are mergeable, ignores
-    // no-ops, and drops final pure "keeps".  It does not re-order
-    // operations.
-    var assem = Changeset.opAssembler();
-    var bufOp = Changeset.newOp();
-
-    // If we get, for example, insertions [xxx\n,yyy], those don't merge,
-    // but if we get [xxx\n,yyy,zzz\n], that merges to [xxx\nyyyzzz\n].
-    // This variable stores the length of yyy and any other newline-less
-    // ops immediately after it.
-    var bufOpAdditionalCharsAfterNewline = 0;
-
-    function flush(isEndDocument) {
-      if (bufOp.opcode) {
-        if (isEndDocument && bufOp.opcode == '=' && ! bufOp.attribs) {
-          // final merged keep, leave it implicit
-        }
-        else {
-          assem.append(bufOp);
-          if (bufOpAdditionalCharsAfterNewline) {
-            bufOp.chars = bufOpAdditionalCharsAfterNewline;
-            bufOp.lines = 0;
-            assem.append(bufOp);
-            bufOpAdditionalCharsAfterNewline = 0;
-          }
-        }
-        bufOp.opcode = '';
-      }
-    }
-    function append(op) {
-      if (op.chars > 0) {
-        if (bufOp.opcode == op.opcode && bufOp.attribs == op.attribs) {
-          if (op.lines > 0) {
-            // bufOp and additional chars are all mergeable into a multi-line op
-            bufOp.chars += bufOpAdditionalCharsAfterNewline + op.chars;
-            bufOp.lines += op.lines;
-            bufOpAdditionalCharsAfterNewline = 0;
-          }
-          else if (bufOp.lines == 0) {
-            // both bufOp and op are in-line
-            bufOp.chars += op.chars;
-          }
-          else {
-            // append in-line text to multi-line bufOp
-            bufOpAdditionalCharsAfterNewline += op.chars;
-          }
-        }
-        else {
-          flush();
-          Changeset.copyOp(op, bufOp);
-        }
-      }
-    }
-    function endDocument() {
-      flush(true);
-    }
-    function toString() {
-      flush();
-      return assem.toString();
-    }
-    function clear() {
-      assem.clear();
-      Changeset.clearOp(bufOp);
-    }
-    return {append: append, toString: toString, clear: clear, endDocument: endDocument};
-  };
-}
-
-if (_opt) {
-  Changeset.opAssembler = function() {
-    var assem = _opt.opAssembler();
-    // this function allows op to be mutated later (doesn't keep a ref)
-    function append(op) {
-      assem.append(op.opcode, op.chars, op.lines, op.attribs);
-    }
-    function toString() {
-      return assem.toString();
-    }
-    function clear() {
-      assem.clear();
-    }
-    return {append: append, toString: toString, clear: clear};
-  };
-}
-else {
-  Changeset.opAssembler = function() {
-    var pieces = [];
-    // this function allows op to be mutated later (doesn't keep a ref)
-    function append(op) {
-      pieces.push(op.attribs);
-      if (op.lines) {
-        pieces.push('|', Changeset.numToString(op.lines));
-      }
-      pieces.push(op.opcode);
-      pieces.push(Changeset.numToString(op.chars));
-    }
-    function toString() {
-      return pieces.join('');
-    }
-    function clear() {
-      pieces.length = 0;
-    }
-    return {append: append, toString: toString, clear: clear};
-  };
-}
-
-Changeset.stringIterator = function(str) {
-  var curIndex = 0;
-  function assertRemaining(n) {
-    Changeset.assert(n <= remaining(), "!(",n," <= ",remaining(),")");
-  }
-  function take(n) {
-    assertRemaining(n);
-    var s = str.substr(curIndex, n);
-    curIndex += n;
-    return s;
-  }
-  function peek(n) {
-    assertRemaining(n);
-    var s = str.substr(curIndex, n);
-    return s;
-  }
-  function skip(n) {
-    assertRemaining(n);
-    curIndex += n;
-  }
-  function remaining() {
-    return str.length - curIndex;
-  }
-  return {take:take, skip:skip, remaining:remaining, peek:peek};
-};
-
-Changeset.stringAssembler = function() {
-  var pieces = [];
-  function append(x) {
-    pieces.push(String(x));
-  }
-  function toString() {
-    return pieces.join('');
-  }
-  return {append: append, toString: toString};
-};
-
-// "lines" need not be an array as long as it supports certain calls (lines_foo inside).
-Changeset.textLinesMutator = function(lines) {
-  // Mutates lines, an array of strings, in place.
-  // Mutation operations have the same constraints as changeset operations
-  // with respect to newlines, but not the other additional constraints
-  // (i.e. ins/del ordering, forbidden no-ops, non-mergeability, final newline).
-  // Can be used to mutate lists of strings where the last char of each string
-  // is not actually a newline, but for the purposes of N and L values,
-  // the caller should pretend it is, and for things to work right in that case, the input
-  // to insert() should be a single line with no newlines.
-
-  var curSplice = [0,0];
-  var inSplice = false;
-  // position in document after curSplice is applied:
-  var curLine = 0, curCol = 0;
-  // invariant: if (inSplice) then (curLine is in curSplice[0] + curSplice.length - {2,3}) &&
-  //            curLine >= curSplice[0]
-  // invariant: if (inSplice && (curLine >= curSplice[0] + curSplice.length - 2)) then
-  //            curCol == 0
-
-  function lines_applySplice(s) {
-    lines.splice.apply(lines, s);
-  }
-  function lines_toSource() {
-    return lines.toSource();
-  }
-  function lines_get(idx) {
-    if (lines.get) {
-      return lines.get(idx);
-    }
-    else {
-      return lines[idx];
-    }
-  }
-  // can be unimplemented if removeLines's return value not needed
-  function lines_slice(start, end) {
-    if (lines.slice) {
-      return lines.slice(start, end);
-    }
-    else {
-      return [];
-    }
-  }
-  function lines_length() {
-    if ((typeof lines.length) == "number") {
-      return lines.length;
-    }
-    else {
-      return lines.length();
-    }
-  }
-
-  function enterSplice() {
-    curSplice[0] = curLine;
-    curSplice[1] = 0;
-    if (curCol > 0) {
-      putCurLineInSplice();
-    }
-    inSplice = true;
-  }
-  function leaveSplice() {
-    lines_applySplice(curSplice);
-    curSplice.length = 2;
-    curSplice[0] = curSplice[1] = 0;
-    inSplice = false;
-  }
-  function isCurLineInSplice() {
-    return (curLine - curSplice[0] < (curSplice.length - 2));
-  }
-  function debugPrint(typ) {
-    print(typ+": "+curSplice.toSource()+" / "+curLine+","+curCol+" / "+lines_toSource());
-  }
-  function putCurLineInSplice() {
-    if (! isCurLineInSplice()) {
-      curSplice.push(lines_get(curSplice[0] + curSplice[1]));
-      curSplice[1]++;
-    }
-    return 2 + curLine - curSplice[0];
-  }
-
-  function skipLines(L, includeInSplice) {
-    if (L) {
-      if (includeInSplice) {
-	if (! inSplice) {
-	  enterSplice();
-	}
-	for(var i=0;i<L;i++) {
-	  curCol = 0;
-	  putCurLineInSplice();
-	  curLine++;
-	}
-      }
-      else {
-	if (inSplice) {
-	  if (L > 1) {
-	    leaveSplice();
-	  }
-	  else {
-	    putCurLineInSplice();
-	  }
-	}
-	curLine += L;
-	curCol = 0;
-      }
-      //print(inSplice+" / "+isCurLineInSplice()+" / "+curSplice[0]+" / "+curSplice[1]+" / "+lines.length);
-      /*if (inSplice && (! isCurLineInSplice()) && (curSplice[0] + curSplice[1] < lines.length)) {
-	  print("BLAH");
-	  putCurLineInSplice();
-	}*/ // tests case foo in remove(), which isn't otherwise covered in current impl
-    }
-    //debugPrint("skip");
-  }
-
-  function skip(N, L, includeInSplice) {
-    if (N) {
-      if (L) {
-	skipLines(L, includeInSplice);
-      }
-      else {
-	if (includeInSplice && ! inSplice) {
-	  enterSplice();
-	}
-	if (inSplice) {
-	  putCurLineInSplice();
-	}
-	curCol += N;
-	//debugPrint("skip");
-      }
-    }
-  }
-
-  function removeLines(L) {
-    var removed = '';
-    if (L) {
-      if (! inSplice) {
-	enterSplice();
-      }
-      function nextKLinesText(k) {
-	var m = curSplice[0] + curSplice[1];
-	return lines_slice(m, m+k).join('');
-      }
-      if (isCurLineInSplice()) {
-	//print(curCol);
-	if (curCol == 0) {
-	  removed = curSplice[curSplice.length-1];
-	  // print("FOO"); // case foo
-	  curSplice.length--;
-	  removed += nextKLinesText(L-1);
-	  curSplice[1] += L-1;
-	}
-	else {
-	  removed = nextKLinesText(L-1);
-	  curSplice[1] += L-1;
-	  var sline = curSplice.length - 1;
-	  removed = curSplice[sline].substring(curCol) + removed;
-	  curSplice[sline] = curSplice[sline].substring(0, curCol) +
-	    lines_get(curSplice[0] + curSplice[1]);
-	  curSplice[1] += 1;
-	}
-      }
-      else {
-	removed = nextKLinesText(L);
-	curSplice[1] += L;
-      }
-      //debugPrint("remove");
-    }
-    return removed;
-  }
-
-  function remove(N, L) {
-    var removed = '';
-    if (N) {
-      if (L) {
-	return removeLines(L);
-      }
-      else {
-	if (! inSplice) {
-	  enterSplice();
-	}
-	var sline = putCurLineInSplice();
-	removed = curSplice[sline].substring(curCol, curCol+N);
-	curSplice[sline] = curSplice[sline].substring(0, curCol) +
-	  curSplice[sline].substring(curCol+N);
-	//debugPrint("remove");
-      }
-    }
-    return removed;
-  }
-
-  function insert(text, L) {
-    if (text) {
-      if (! inSplice) {
-	enterSplice();
-      }
-      if (L) {
-	var newLines = Changeset.splitTextLines(text);
-	if (isCurLineInSplice()) {
-	  //if (curCol == 0) {
-	  //curSplice.length--;
-	  //curSplice[1]--;
-	  //Array.prototype.push.apply(curSplice, newLines);
-	  //curLine += newLines.length;
-	  //}
-	  //else {
-	  var sline = curSplice.length - 1;
-	  var theLine = curSplice[sline];
-	  var lineCol = curCol;
-	  curSplice[sline] = theLine.substring(0, lineCol) + newLines[0];
-	  curLine++;
-	  newLines.splice(0, 1);
-	  Array.prototype.push.apply(curSplice, newLines);
-	  curLine += newLines.length;
-	  curSplice.push(theLine.substring(lineCol));
-	  curCol = 0;
-	  //}
-	}
-	else {
-	  Array.prototype.push.apply(curSplice, newLines);
-	  curLine += newLines.length;
-	}
-      }
-      else {
-	var sline = putCurLineInSplice();
-	curSplice[sline] = curSplice[sline].substring(0, curCol) +
-	  text + curSplice[sline].substring(curCol);
-	curCol += text.length;
-      }
-      //debugPrint("insert");
-    }
-  }
-
-  function hasMore() {
-    //print(lines.length+" / "+inSplice+" / "+(curSplice.length - 2)+" / "+curSplice[1]);
-    var docLines = lines_length();
-    if (inSplice) {
-      docLines += curSplice.length - 2 - curSplice[1];
-    }
-    return curLine < docLines;
-  }
-
-  function close() {
-    if (inSplice) {
-      leaveSplice();
-    }
-    //debugPrint("close");
-  }
-
-  var self = {skip:skip, remove:remove, insert:insert, close:close, hasMore:hasMore,
-    removeLines:removeLines, skipLines: skipLines};
-  return self;
-};
-
-Changeset.applyZip = function(in1, idx1, in2, idx2, func) {
-  var iter1 = Changeset.opIterator(in1, idx1);
-  var iter2 = Changeset.opIterator(in2, idx2);
-  var assem = Changeset.smartOpAssembler();
-  var op1 = Changeset.newOp();
-  var op2 = Changeset.newOp();
-  var opOut = Changeset.newOp();
-  while (op1.opcode || iter1.hasNext() || op2.opcode || iter2.hasNext()) {
-    if ((! op1.opcode) && iter1.hasNext()) iter1.next(op1);
-    if ((! op2.opcode) && iter2.hasNext()) iter2.next(op2);
-    func(op1, op2, opOut);
-    if (opOut.opcode) {
-      //print(opOut.toSource());
-      assem.append(opOut);
-      opOut.opcode = '';
-    }
-  }
-  assem.endDocument();
-  return assem.toString();
-};
-
-Changeset.unpack = function(cs) {
-  var headerRegex = /Z:([0-9a-z]+)([><])([0-9a-z]+)|/;
-  var headerMatch = headerRegex.exec(cs);
-  if ((! headerMatch) || (! headerMatch[0])) {
-    Changeset.error("Not a changeset: "+cs);
-  }
-  var oldLen = Changeset.parseNum(headerMatch[1]);
-  var changeSign = (headerMatch[2] == '>') ? 1 : -1;
-  var changeMag = Changeset.parseNum(headerMatch[3]);
-  var newLen = oldLen + changeSign*changeMag;
-  var opsStart = headerMatch[0].length;
-  var opsEnd = cs.indexOf("$");
-  if (opsEnd < 0) opsEnd = cs.length;
-  return {oldLen: oldLen, newLen: newLen, ops: cs.substring(opsStart, opsEnd),
-	  charBank: cs.substring(opsEnd+1)};
-};
-
-Changeset.pack = function(oldLen, newLen, opsStr, bank) {
-  var lenDiff = newLen - oldLen;
-  var lenDiffStr = (lenDiff >= 0 ?
-		    '>'+Changeset.numToString(lenDiff) :
-		    '<'+Changeset.numToString(-lenDiff));
-  var a = [];
-  a.push('Z:', Changeset.numToString(oldLen), lenDiffStr, opsStr, '$', bank);
-  return a.join('');
-};
-
-Changeset.applyToText = function(cs, str) {
-  var unpacked = Changeset.unpack(cs);
-  Changeset.assert(str.length == unpacked.oldLen,
-		   "mismatched apply: ",str.length," / ",unpacked.oldLen);
-  var csIter = Changeset.opIterator(unpacked.ops);
-  var bankIter = Changeset.stringIterator(unpacked.charBank);
-  var strIter = Changeset.stringIterator(str);
-  var assem = Changeset.stringAssembler();
-  while (csIter.hasNext()) {
-    var op = csIter.next();
-    switch(op.opcode) {
-    case '+': assem.append(bankIter.take(op.chars)); break;
-    case '-': strIter.skip(op.chars); break;
-    case '=': assem.append(strIter.take(op.chars)); break;
-    }
-  }
-  assem.append(strIter.take(strIter.remaining()));
-  return assem.toString();
-};
-
-Changeset.mutateTextLines = function(cs, lines) {
-  var unpacked = Changeset.unpack(cs);
-  var csIter = Changeset.opIterator(unpacked.ops);
-  var bankIter = Changeset.stringIterator(unpacked.charBank);
-  var mut = Changeset.textLinesMutator(lines);
-  while (csIter.hasNext()) {
-    var op = csIter.next();
-    switch(op.opcode) {
-    case '+': mut.insert(bankIter.take(op.chars), op.lines); break;
-    case '-': mut.remove(op.chars, op.lines); break;
-    case '=': mut.skip(op.chars, op.lines, (!! op.attribs)); break;
-    }
-  }
-  mut.close();
-};
-
-Changeset.composeAttributes = function(att1, att2, resultIsMutation, pool) {
-  // att1 and att2 are strings like "*3*f*1c", asMutation is a boolean.
-
-  // Sometimes attribute (key,value) pairs are treated as attribute presence
-  // information, while other times they are treated as operations that
-  // mutate a set of attributes, and this affects whether an empty value
-  // is a deletion or a change.
-  // Examples, of the form (att1Items, att2Items, resultIsMutation) -> result
-  // ([], [(bold, )], true) -> [(bold, )]
-  // ([], [(bold, )], false) -> []
-  // ([], [(bold, true)], true) -> [(bold, true)]
-  // ([], [(bold, true)], false) -> [(bold, true)]
-  // ([(bold, true)], [(bold, )], true) -> [(bold, )]
-  // ([(bold, true)], [(bold, )], false) -> []
-
-  // pool can be null if att2 has no attributes.
-
-  if ((! att1) && resultIsMutation) {
-    // In the case of a mutation (i.e. composing two changesets),
-    // an att2 composed with an empy att1 is just att2.  If att1
-    // is part of an attribution string, then att2 may remove
-    // attributes that are already gone, so don't do this optimization.
-    return att2;
-  }
-  if (! att2) return att1;
-  var atts = [];
-  att1.replace(/\*([0-9a-z]+)/g, function(_, a) {
-    atts.push(pool.getAttrib(Changeset.parseNum(a)));
-    return '';
-  });
-  att2.replace(/\*([0-9a-z]+)/g, function(_, a) {
-    var pair = pool.getAttrib(Changeset.parseNum(a));
-    var found = false;
-    for(var i=0;i<atts.length;i++) {
-      var oldPair = atts[i];
-      if (oldPair[0] == pair[0]) {
-	if (pair[1] || resultIsMutation) {
-	  oldPair[1] = pair[1];
-	}
-	else {
-	  atts.splice(i, 1);
-	}
-	found = true;
-	break;
-      }
-    }
-    if ((! found) && (pair[1] || resultIsMutation)) {
-      atts.push(pair);
-    }
-    return '';
-  });
-  atts.sort();
-  var buf = Changeset.stringAssembler();
-  for(var i=0;i<atts.length;i++) {
-    buf.append('*');
-    buf.append(Changeset.numToString(pool.putAttrib(atts[i])));
-  }
-  //print(att1+" / "+att2+" / "+buf.toString());
-  return buf.toString();
-};
-
-Changeset._slicerZipperFunc = function(attOp, csOp, opOut, pool) {
-  // attOp is the op from the sequence that is being operated on, either an
-  // attribution string or the earlier of two changesets being composed.
-  // pool can be null if definitely not needed.
-
-  //print(csOp.toSource()+" "+attOp.toSource()+" "+opOut.toSource());
-  if (attOp.opcode == '-') {
-    Changeset.copyOp(attOp, opOut);
-    attOp.opcode = '';
-  }
-  else if (! attOp.opcode) {
-    Changeset.copyOp(csOp, opOut);
-    csOp.opcode = '';
-  }
-  else {
-    switch (csOp.opcode) {
-    case '-': {
-      if (csOp.chars <= attOp.chars) {
-	// delete or delete part
-	if (attOp.opcode == '=') {
-	  opOut.opcode = '-';
-	  opOut.chars = csOp.chars;
-	  opOut.lines = csOp.lines;
-	  opOut.attribs = '';
-	}
-	attOp.chars -= csOp.chars;
-	attOp.lines -= csOp.lines;
-	csOp.opcode = '';
-	if (! attOp.chars) {
-	  attOp.opcode = '';
-	}
-      }
-      else {
-	// delete and keep going
-	if (attOp.opcode == '=') {
-	  opOut.opcode = '-';
-	  opOut.chars = attOp.chars;
-	  opOut.lines = attOp.lines;
-	  opOut.attribs = '';
-	}
-	csOp.chars -= attOp.chars;
-	csOp.lines -= attOp.lines;
-	attOp.opcode = '';
-      }
-      break;
-    }
-    case '+': {
-      // insert
-      Changeset.copyOp(csOp, opOut);
-      csOp.opcode = '';
-      break;
-    }
-    case '=': {
-      if (csOp.chars <= attOp.chars) {
-	// keep or keep part
-	opOut.opcode = attOp.opcode;
-	opOut.chars = csOp.chars;
-	opOut.lines = csOp.lines;
-	opOut.attribs = Changeset.composeAttributes(attOp.attribs, csOp.attribs,
-						    attOp.opcode == '=', pool);
-	csOp.opcode = '';
-	attOp.chars -= csOp.chars;
-	attOp.lines -= csOp.lines;
-	if (! attOp.chars) {
-	  attOp.opcode = '';
-	}
-      }
-      else {
-	// keep and keep going
-	opOut.opcode = attOp.opcode;
-	opOut.chars = attOp.chars;
-	opOut.lines = attOp.lines;
-	opOut.attribs = Changeset.composeAttributes(attOp.attribs, csOp.attribs,
-						    attOp.opcode == '=', pool);
-	attOp.opcode = '';
-	csOp.chars -= attOp.chars;
-	csOp.lines -= attOp.lines;
-      }
-      break;
-    }
-    case '': {
-      Changeset.copyOp(attOp, opOut);
-      attOp.opcode = '';
-      break;
-    }
-    }
-  }
-};
-
-Changeset.applyToAttribution = function(cs, astr, pool) {
-  var unpacked = Changeset.unpack(cs);
-
-  return Changeset.applyZip(astr, 0, unpacked.ops, 0, function(op1, op2, opOut) {
-    return Changeset._slicerZipperFunc(op1, op2, opOut, pool);
-  });
-};
-
-/*Changeset.oneInsertedLineAtATimeOpIterator = function(opsStr, optStartIndex, charBank) {
-  var iter = Changeset.opIterator(opsStr, optStartIndex);
-  var bankIndex = 0;
-
-};*/
-
-Changeset.mutateAttributionLines = function(cs, lines, pool) {
-  //dmesg(cs);
-  //dmesg(lines.toSource()+" ->");
-
-  var unpacked = Changeset.unpack(cs);
-  var csIter = Changeset.opIterator(unpacked.ops);
-  var csBank = unpacked.charBank;
-  var csBankIndex = 0;
-  // treat the attribution lines as text lines, mutating a line at a time
-  var mut = Changeset.textLinesMutator(lines);
-
-  var lineIter = null;
-  function isNextMutOp() {
-    return (lineIter && lineIter.hasNext()) || mut.hasMore();
-  }
-  function nextMutOp(destOp) {
-    if ((!(lineIter && lineIter.hasNext())) && mut.hasMore()) {
-      var line = mut.removeLines(1);
-      lineIter = Changeset.opIterator(line);
-    }
-    if (lineIter && lineIter.hasNext()) {
-      lineIter.next(destOp);
-    }
-    else {
-      destOp.opcode = '';
-    }
-  }
-  var lineAssem = null;
-  function outputMutOp(op) {
-    //print("outputMutOp: "+op.toSource());
-    if (! lineAssem) {
-      lineAssem = Changeset.mergingOpAssembler();
-    }
-    lineAssem.append(op);
-    if (op.lines > 0) {
-      Changeset.assert(op.lines == 1, "Can't have op.lines of ",op.lines," in attribution lines");
-      // ship it to the mut
-      mut.insert(lineAssem.toString(), 1);
-      lineAssem = null;
-    }
-  }
-
-  var csOp = Changeset.newOp();
-  var attOp = Changeset.newOp();
-  var opOut = Changeset.newOp();
-  while (csOp.opcode || csIter.hasNext() || attOp.opcode || isNextMutOp()) {
-    if ((! csOp.opcode) && csIter.hasNext()) {
-      csIter.next(csOp);
-    }
-    //print(csOp.toSource()+" "+attOp.toSource()+" "+opOut.toSource());
-    //print(csOp.opcode+"/"+csOp.lines+"/"+csOp.attribs+"/"+lineAssem+"/"+lineIter+"/"+(lineIter?lineIter.hasNext():null));
-    //print("csOp: "+csOp.toSource());
-    if ((! csOp.opcode) && (! attOp.opcode) &&
-	(! lineAssem) && (! (lineIter && lineIter.hasNext()))) {
-      break; // done
-    }
-    else if (csOp.opcode == '=' && csOp.lines > 0 && (! csOp.attribs) && (! attOp.opcode) &&
-	     (! lineAssem) && (! (lineIter && lineIter.hasNext()))) {
-      // skip multiple lines; this is what makes small changes not order of the document size
-      mut.skipLines(csOp.lines);
-      //print("skipped: "+csOp.lines);
-      csOp.opcode = '';
-    }
-    else if (csOp.opcode == '+') {
-      if (csOp.lines > 1) {
-	var firstLineLen = csBank.indexOf('\n', csBankIndex) + 1 - csBankIndex;
-	Changeset.copyOp(csOp, opOut);
-	csOp.chars -= firstLineLen;
-	csOp.lines--;
-	opOut.lines = 1;
-	opOut.chars = firstLineLen;
-      }
-      else {
-	Changeset.copyOp(csOp, opOut);
-	csOp.opcode = '';
-      }
-      outputMutOp(opOut);
-      csBankIndex += opOut.chars;
-      opOut.opcode = '';
-    }
-    else {
-      if ((! attOp.opcode) && isNextMutOp()) {
-	nextMutOp(attOp);
-      }
-      //print("attOp: "+attOp.toSource());
-      Changeset._slicerZipperFunc(attOp, csOp, opOut, pool);
-      if (opOut.opcode) {
-	outputMutOp(opOut);
-	opOut.opcode = '';
-      }
-    }
-  }
-
-  Changeset.assert(! lineAssem, "line assembler not finished");
-  mut.close();
-
-  //dmesg("-> "+lines.toSource());
-};
-
-Changeset.joinAttributionLines = function(theAlines) {
-  var assem = Changeset.mergingOpAssembler();
-  for(var i=0;i<theAlines.length;i++) {
-    var aline = theAlines[i];
-    var iter = Changeset.opIterator(aline);
-    while (iter.hasNext()) {
-      assem.append(iter.next());
-    }
-  }
-  return assem.toString();
-};
-
-Changeset.splitAttributionLines = function(attrOps, text) {
-  var iter = Changeset.opIterator(attrOps);
-  var assem = Changeset.mergingOpAssembler();
-  var lines = [];
-  var pos = 0;
-
-  function appendOp(op) {
-    assem.append(op);
-    if (op.lines > 0) {
-      lines.push(assem.toString());
-      assem.clear();
-    }
-    pos += op.chars;
-  }
-
-  while (iter.hasNext()) {
-    var op = iter.next();
-    var numChars = op.chars;
-    var numLines = op.lines;
-    while (numLines > 1) {
-      var newlineEnd = text.indexOf('\n', pos)+1;
-      Changeset.assert(newlineEnd > 0, "newlineEnd <= 0 in splitAttributionLines");
-      op.chars = newlineEnd - pos;
-      op.lines = 1;
-      appendOp(op);
-      numChars -= op.chars;
-      numLines -= op.lines;
-    }
-    if (numLines == 1) {
-      op.chars = numChars;
-      op.lines = 1;
-    }
-    appendOp(op);
-  }
-
-  return lines;
-};
-
-Changeset.splitTextLines = function(text) {
-  return text.match(/[^\n]*(?:\n|[^\n]$)/g);
-};
-
-Changeset.compose = function(cs1, cs2, pool) {
-  var unpacked1 = Changeset.unpack(cs1);
-  var unpacked2 = Changeset.unpack(cs2);
-  var len1 = unpacked1.oldLen;
-  var len2 = unpacked1.newLen;
-  Changeset.assert(len2 == unpacked2.oldLen, "mismatched composition");
-  var len3 = unpacked2.newLen;
-  var bankIter1 = Changeset.stringIterator(unpacked1.charBank);
-  var bankIter2 = Changeset.stringIterator(unpacked2.charBank);
-  var bankAssem = Changeset.stringAssembler();
-
-  var newOps = Changeset.applyZip(unpacked1.ops, 0, unpacked2.ops, 0, function(op1, op2, opOut) {
-    //var debugBuilder = Changeset.stringAssembler();
-    //debugBuilder.append(Changeset.opString(op1));
-    //debugBuilder.append(',');
-    //debugBuilder.append(Changeset.opString(op2));
-    //debugBuilder.append(' / ');
-
-    var op1code = op1.opcode;
-    var op2code = op2.opcode;
-    if (op1code == '+' && op2code == '-') {
-      bankIter1.skip(Math.min(op1.chars, op2.chars));
-    }
-    Changeset._slicerZipperFunc(op1, op2, opOut, pool);
-    if (opOut.opcode == '+') {
-      if (op2code == '+') {
-	bankAssem.append(bankIter2.take(opOut.chars));
-      }
-      else {
-	bankAssem.append(bankIter1.take(opOut.chars));
-      }
-    }
-
-    //debugBuilder.append(Changeset.opString(op1));
-    //debugBuilder.append(',');
-    //debugBuilder.append(Changeset.opString(op2));
-    //debugBuilder.append(' -> ');
-    //debugBuilder.append(Changeset.opString(opOut));
-    //print(debugBuilder.toString());
-  });
-
-  return Changeset.pack(len1, len3, newOps, bankAssem.toString());
-};
-
-Changeset.attributeTester = function(attribPair, pool) {
-  // returns a function that tests if a string of attributes
-  // (e.g. *3*4) contains a given attribute key,value that
-  // is already present in the pool.
-  if (! pool) {
-    return never;
-  }
-  var attribNum = pool.putAttrib(attribPair, true);
-  if (attribNum < 0) {
-    return never;
-  }
-  else {
-    var re = new RegExp('\\*'+Changeset.numToString(attribNum)+
-                        '(?!\\w)');
-    return function(attribs) {
-      return re.test(attribs);
-    };
-  }
-  function never(attribs) { return false; }
-};
-
-Changeset.identity = function(N) {
-  return Changeset.pack(N, N, "", "");
-};
-
-Changeset.makeSplice = function(oldFullText, spliceStart, numRemoved, newText, optNewTextAPairs, pool) {
-  var oldLen = oldFullText.length;
-
-  if (spliceStart >= oldLen) {
-    spliceStart = oldLen - 1;
-  }
-  if (numRemoved > oldFullText.length - spliceStart - 1) {
-    numRemoved = oldFullText.length - spliceStart - 1;
-  }
-  var oldText = oldFullText.substring(spliceStart, spliceStart+numRemoved);
-  var newLen = oldLen + newText.length - oldText.length;
-
-  var assem = Changeset.smartOpAssembler();
-  assem.appendOpWithText('=', oldFullText.substring(0, spliceStart));
-  assem.appendOpWithText('-', oldText);
-  assem.appendOpWithText('+', newText, optNewTextAPairs, pool);
-  assem.endDocument();
-  return Changeset.pack(oldLen, newLen, assem.toString(), newText);
-};
-
-Changeset.toSplices = function(cs) {
-  // get a list of splices, [startChar, endChar, newText]
-
-  var unpacked = Changeset.unpack(cs);
-  var splices = [];
-
-  var oldPos = 0;
-  var iter = Changeset.opIterator(unpacked.ops);
-  var charIter = Changeset.stringIterator(unpacked.charBank);
-  var inSplice = false;
-  while (iter.hasNext()) {
-    var op = iter.next();
-    if (op.opcode == '=') {
-      oldPos += op.chars;
-      inSplice = false;
-    }
-    else {
-      if (! inSplice) {
-	splices.push([oldPos, oldPos, ""]);
-	inSplice = true;
-      }
-      if (op.opcode == '-') {
-	oldPos += op.chars;
-	splices[splices.length-1][1] += op.chars;
-      }
-      else if (op.opcode == '+') {
-	splices[splices.length-1][2] += charIter.take(op.chars);
-      }
-    }
-  }
-
-  return splices;
-};
-
-Changeset.characterRangeFollow = function(cs, startChar, endChar, insertionsAfter) {
-  var newStartChar = startChar;
-  var newEndChar = endChar;
-  var splices = Changeset.toSplices(cs);
-  var lengthChangeSoFar = 0;
-  for(var i=0;i<splices.length;i++) {
-    var splice = splices[i];
-    var spliceStart = splice[0] + lengthChangeSoFar;
-    var spliceEnd = splice[1] + lengthChangeSoFar;
-    var newTextLength = splice[2].length;
-    var thisLengthChange = newTextLength - (spliceEnd - spliceStart);
-
-    if (spliceStart <= newStartChar && spliceEnd >= newEndChar) {
-      // splice fully replaces/deletes range
-      // (also case that handles insertion at a collapsed selection)
-      if (insertionsAfter) {
-	newStartChar = newEndChar = spliceStart;
-      }
-      else {
-	newStartChar = newEndChar = spliceStart + newTextLength;
-      }
-    }
-    else if (spliceEnd <= newStartChar) {
-      // splice is before range
-      newStartChar += thisLengthChange;
-      newEndChar += thisLengthChange;
-    }
-    else if (spliceStart >= newEndChar) {
-      // splice is after range
-    }
-    else if (spliceStart >= newStartChar && spliceEnd <= newEndChar) {
-      // splice is inside range
-      newEndChar += thisLengthChange;
-    }
-    else if (spliceEnd < newEndChar) {
-      // splice overlaps beginning of range
-      newStartChar = spliceStart + newTextLength;
-      newEndChar += thisLengthChange;
-    }
-    else {
-      // splice overlaps end of range
-      newEndChar = spliceStart;
-    }
-
-    lengthChangeSoFar += thisLengthChange;
-  }
-
-  return [newStartChar, newEndChar];
-};
-
-Changeset.moveOpsToNewPool = function(cs, oldPool, newPool) {
-  // works on changeset or attribution string
-  var dollarPos = cs.indexOf('$');
-  if (dollarPos < 0) {
-    dollarPos = cs.length;
-  }
-  var upToDollar = cs.substring(0, dollarPos);
-  var fromDollar = cs.substring(dollarPos);
-  // order of attribs stays the same
-  return upToDollar.replace(/\*([0-9a-z]+)/g, function(_, a) {
-    var oldNum = Changeset.parseNum(a);
-    var pair = oldPool.getAttrib(oldNum);
-    var newNum = newPool.putAttrib(pair);
-    return '*'+Changeset.numToString(newNum);
-  }) + fromDollar;
-};
-
-Changeset.makeAttribution = function(text) {
-  var assem = Changeset.smartOpAssembler();
-  assem.appendOpWithText('+', text);
-  return assem.toString();
-};
-
-// callable on a changeset, attribution string, or attribs property of an op
-Changeset.eachAttribNumber = function(cs, func) {
-  var dollarPos = cs.indexOf('$');
-  if (dollarPos < 0) {
-    dollarPos = cs.length;
-  }
-  var upToDollar = cs.substring(0, dollarPos);
-
-  upToDollar.replace(/\*([0-9a-z]+)/g, function(_, a) {
-    func(Changeset.parseNum(a));
-    return '';
-  });
-};
-
-// callable on a changeset, attribution string, or attribs property of an op,
-// though it may easily create adjacent ops that can be merged.
-Changeset.filterAttribNumbers = function(cs, filter) {
-  return Changeset.mapAttribNumbers(cs, filter);
-};
-
-Changeset.mapAttribNumbers = function(cs, func) {
-  var dollarPos = cs.indexOf('$');
-  if (dollarPos < 0) {
-    dollarPos = cs.length;
-  }
-  var upToDollar = cs.substring(0, dollarPos);
-
-  var newUpToDollar = upToDollar.replace(/\*([0-9a-z]+)/g, function(s, a) {
-    var n = func(Changeset.parseNum(a));
-    if (n === true) {
-      return s;
-    }
-    else if ((typeof n) === "number") {
-      return '*'+Changeset.numToString(n);
-    }
-    else {
-      return '';
-    }
-  });
-
-  return newUpToDollar + cs.substring(dollarPos);
-};
-
-Changeset.makeAText = function(text, attribs) {
-  return { text: text, attribs: (attribs || Changeset.makeAttribution(text)) };
-};
-
-Changeset.applyToAText = function(cs, atext, pool) {
-  return { text: Changeset.applyToText(cs, atext.text),
-	   attribs: Changeset.applyToAttribution(cs, atext.attribs, pool) };
-};
-
-Changeset.cloneAText = function(atext) {
-  return { text: atext.text, attribs: atext.attribs };
-};
-
-Changeset.copyAText = function(atext1, atext2) {
-  atext2.text = atext1.text;
-  atext2.attribs = atext1.attribs;
-};
-
-Changeset.appendATextToAssembler = function(atext, assem) {
-  // intentionally skips last newline char of atext
-  var iter = Changeset.opIterator(atext.attribs);
-  var op = Changeset.newOp();
-  while (iter.hasNext()) {
-    iter.next(op);
-    if (! iter.hasNext()) {
-      // last op, exclude final newline
-      if (op.lines <= 1) {
-	op.lines = 0;
-	op.chars--;
-	if (op.chars) {
-	  assem.append(op);
-	}
-      }
-      else {
-	var nextToLastNewlineEnd =
-	  atext.text.lastIndexOf('\n', atext.text.length-2) + 1;
-	var lastLineLength = atext.text.length - nextToLastNewlineEnd - 1;
-	op.lines--;
-	op.chars -= (lastLineLength + 1);
-	assem.append(op);
-	op.lines = 0;
-	op.chars = lastLineLength;
-	if (op.chars) {
-	  assem.append(op);
-	}
-      }
-    }
-    else {
-      assem.append(op);
-    }
-  }
-};
-
-Changeset.prepareForWire = function(cs, pool) {
-  var newPool = new AttribPool();
-  var newCs = Changeset.moveOpsToNewPool(cs, pool, newPool);
-  return {translated: newCs, pool: newPool};
-};
-
-Changeset.isIdentity = function(cs) {
-  var unpacked = Changeset.unpack(cs);
-  return unpacked.ops == "" && unpacked.oldLen == unpacked.newLen;
-};
-
-Changeset.opAttributeValue = function(op, key, pool) {
-  return Changeset.attribsAttributeValue(op.attribs, key, pool);
-};
-
-Changeset.attribsAttributeValue = function(attribs, key, pool) {
-  var value = '';
-  if (attribs) {
-    Changeset.eachAttribNumber(attribs, function(n) {
-      if (pool.getAttribKey(n) == key) {
-        value = pool.getAttribValue(n);
-      }
-    });
-  }
-  return value;
-};
-
-Changeset.builder = function(oldLen) {
-  var assem = Changeset.smartOpAssembler();
-  var o = Changeset.newOp();
-  var charBank = Changeset.stringAssembler();
-
-  var self = {
-    // attribs are [[key1,value1],[key2,value2],...] or '*0*1...' (no pool needed in latter case)
-    keep: function(N, L, attribs, pool) {
-      o.opcode = '=';
-      o.attribs = (attribs &&
-                   Changeset.makeAttribsString('=', attribs, pool)) || '';
-      o.chars = N;
-      o.lines = (L || 0);
-      assem.append(o);
-      return self;
-    },
-    keepText: function(text, attribs, pool) {
-      assem.appendOpWithText('=', text, attribs, pool);
-      return self;
-    },
-    insert: function(text, attribs, pool) {
-      assem.appendOpWithText('+', text, attribs, pool);
-      charBank.append(text);
-      return self;
-    },
-    remove: function(N, L) {
-      o.opcode = '-';
-      o.attribs = '';
-      o.chars = N;
-      o.lines = (L || 0);
-      assem.append(o);
-      return self;
-    },
-    toString: function() {
-      assem.endDocument();
-      var newLen = oldLen + assem.getLengthChange();
-      return Changeset.pack(oldLen, newLen, assem.toString(),
-			    charBank.toString());
-    }
-  };
-
-  return self;
-};
-
-Changeset.makeAttribsString = function(opcode, attribs, pool) {
-  // makeAttribsString(opcode, '*3') or makeAttribsString(opcode, [['foo','bar']], myPool) work
-  if (! attribs) {
-    return '';
-  }
-  else if ((typeof attribs) == "string") {
-    return attribs;
-  }
-  else if (pool && attribs && attribs.length) {
-    if (attribs.length > 1) {
-      attribs = attribs.slice();
-      attribs.sort();
-    }
-    var result = [];
-    for(var i=0;i<attribs.length;i++) {
-      var pair = attribs[i];
-      if (opcode == '=' || (opcode == '+' && pair[1])) {
-	result.push('*'+Changeset.numToString(pool.putAttrib(pair)));
-      }
-    }
-    return result.join('');
-  }
-};
-
-// like "substring" but on a single-line attribution string
-Changeset.subattribution = function(astr, start, optEnd) {
-  var iter = Changeset.opIterator(astr, 0);
-  var assem = Changeset.smartOpAssembler();
-  var attOp = Changeset.newOp();
-  var csOp = Changeset.newOp();
-  var opOut = Changeset.newOp();
-
-  function doCsOp() {
-    if (csOp.chars) {
-      while (csOp.opcode && (attOp.opcode || iter.hasNext())) {
-	if (! attOp.opcode) iter.next(attOp);
-
-	if (csOp.opcode && attOp.opcode && csOp.chars >= attOp.chars &&
-	    attOp.lines > 0 && csOp.lines <= 0) {
-	  csOp.lines++;
-	}
-
-	Changeset._slicerZipperFunc(attOp, csOp, opOut, null);
-	if (opOut.opcode) {
-	  assem.append(opOut);
-	  opOut.opcode = '';
-	}
-      }
-    }
-  }
-
-  csOp.opcode = '-';
-  csOp.chars = start;
-
-  doCsOp();
-
-  if (optEnd === undefined) {
-    if (attOp.opcode) {
-      assem.append(attOp);
-    }
-    while (iter.hasNext()) {
-      iter.next(attOp);
-      assem.append(attOp);
-    }
-  }
-  else {
-    csOp.opcode = '=';
-    csOp.chars = optEnd - start;
-    doCsOp();
-  }
-
-  return assem.toString();
-};
-
-Changeset.inverse = function(cs, lines, alines, pool) {
-  // lines and alines are what the changeset is meant to apply to.
-  // They may be arrays or objects with .get(i) and .length methods.
-  // They include final newlines on lines.
-  function lines_get(idx) {
-    if (lines.get) {
-      return lines.get(idx);
-    }
-    else {
-      return lines[idx];
-    }
-  }
-  function lines_length() {
-    if ((typeof lines.length) == "number") {
-      return lines.length;
-    }
-    else {
-      return lines.length();
-    }
-  }
-  function alines_get(idx) {
-    if (alines.get) {
-      return alines.get(idx);
-    }
-    else {
-      return alines[idx];
-    }
-  }
-  function alines_length() {
-    if ((typeof alines.length) == "number") {
-      return alines.length;
-    }
-    else {
-      return alines.length();
-    }
-  }
-
-  var curLine = 0;
-  var curChar = 0;
-  var curLineOpIter = null;
-  var curLineOpIterLine;
-  var curLineNextOp = Changeset.newOp('+');
-
-  var unpacked = Changeset.unpack(cs);
-  var csIter = Changeset.opIterator(unpacked.ops);
-  var builder = Changeset.builder(unpacked.newLen);
-
-  function consumeAttribRuns(numChars, func/*(len, attribs, endsLine)*/) {
-
-    if ((! curLineOpIter) || (curLineOpIterLine != curLine)) {
-      // create curLineOpIter and advance it to curChar
-      curLineOpIter = Changeset.opIterator(alines_get(curLine));
-      curLineOpIterLine = curLine;
-      var indexIntoLine = 0;
-      var done = false;
-      while (! done) {
-	curLineOpIter.next(curLineNextOp);
-	if (indexIntoLine + curLineNextOp.chars >= curChar) {
-	  curLineNextOp.chars -= (curChar - indexIntoLine);
-	  done = true;
-	}
-	else {
-	  indexIntoLine += curLineNextOp.chars;
-	}
-      }
-    }
-
-    while (numChars > 0) {
-      if ((! curLineNextOp.chars) && (! curLineOpIter.hasNext())) {
-	curLine++;
-	curChar = 0;
-	curLineOpIterLine = curLine;
-	curLineNextOp.chars = 0;
-	curLineOpIter = Changeset.opIterator(alines_get(curLine));
-      }
-      if (! curLineNextOp.chars) {
-	curLineOpIter.next(curLineNextOp);
-      }
-      var charsToUse = Math.min(numChars, curLineNextOp.chars);
-      func(charsToUse, curLineNextOp.attribs,
-	   charsToUse == curLineNextOp.chars && curLineNextOp.lines > 0);
-      numChars -= charsToUse;
-      curLineNextOp.chars -= charsToUse;
-      curChar += charsToUse;
-    }
-
-    if ((! curLineNextOp.chars) && (! curLineOpIter.hasNext())) {
-      curLine++;
-      curChar = 0;
-    }
-  }
-
-  function skip(N, L) {
-    if (L) {
-      curLine += L;
-      curChar = 0;
-    }
-    else {
-      if (curLineOpIter && curLineOpIterLine == curLine) {
-	consumeAttribRuns(N, function() {});
-      }
-      else {
-	curChar += N;
-      }
-    }
-  }
-
-  function nextText(numChars) {
-    var len = 0;
-    var assem = Changeset.stringAssembler();
-    var firstString = lines_get(curLine).substring(curChar);
-    len += firstString.length;
-    assem.append(firstString);
-
-    var lineNum = curLine+1;
-    while (len < numChars) {
-      var nextString = lines_get(lineNum);
-      len += nextString.length;
-      assem.append(nextString);
-      lineNum++;
-    }
-
-    return assem.toString().substring(0, numChars);
-  }
-
-  function cachedStrFunc(func) {
-    var cache = {};
-    return function(s) {
-      if (! cache[s]) {
-	cache[s] = func(s);
-      }
-      return cache[s];
-    };
-  }
-
-  var attribKeys = [];
-  var attribValues = [];
-  while (csIter.hasNext()) {
-    var csOp = csIter.next();
-    if (csOp.opcode == '=') {
-      if (csOp.attribs) {
-	attribKeys.length = 0;
-	attribValues.length = 0;
-	Changeset.eachAttribNumber(csOp.attribs, function(n) {
-	  attribKeys.push(pool.getAttribKey(n));
-	  attribValues.push(pool.getAttribValue(n));
-	});
-	var undoBackToAttribs = cachedStrFunc(function(attribs) {
-	  var backAttribs = [];
-	  for(var i=0;i<attribKeys.length;i++) {
-	    var appliedKey = attribKeys[i];
-	    var appliedValue = attribValues[i];
-	    var oldValue = Changeset.attribsAttributeValue(attribs, appliedKey, pool);
-	    if (appliedValue != oldValue) {
-	      backAttribs.push([appliedKey, oldValue]);
-	    }
-	  }
-	  return Changeset.makeAttribsString('=', backAttribs, pool);
-	});
-	consumeAttribRuns(csOp.chars, function(len, attribs, endsLine) {
-	  builder.keep(len, endsLine ? 1 : 0, undoBackToAttribs(attribs));
-	});
-      }
-      else {
-	skip(csOp.chars, csOp.lines);
-	builder.keep(csOp.chars, csOp.lines);
-      }
-    }
-    else if (csOp.opcode == '+') {
-      builder.remove(csOp.chars, csOp.lines);
-    }
-    else if (csOp.opcode == '-') {
-      var textBank = nextText(csOp.chars);
-      var textBankIndex = 0;
-      consumeAttribRuns(csOp.chars, function(len, attribs, endsLine) {
-	builder.insert(textBank.substr(textBankIndex, len), attribs);
-	textBankIndex += len;
-      });
-    }
-  }
-
-  return Changeset.checkRep(builder.toString());
-};
-
-// %CLIENT FILE ENDS HERE%
-
-Changeset.follow = function(cs1, cs2, reverseInsertOrder, pool) {
-  var unpacked1 = Changeset.unpack(cs1);
-  var unpacked2 = Changeset.unpack(cs2);
-  var len1 = unpacked1.oldLen;
-  var len2 = unpacked2.oldLen;
-  Changeset.assert(len1 == len2, "mismatched follow");
-  var chars1 = Changeset.stringIterator(unpacked1.charBank);
-  var chars2 = Changeset.stringIterator(unpacked2.charBank);
-
-  var oldLen = unpacked1.newLen;
-  var oldPos = 0;
-  var newLen = 0;
-
-  var hasInsertFirst = Changeset.attributeTester(['insertorder','first'],
-                                                 pool);
-
-  var newOps = Changeset.applyZip(unpacked1.ops, 0, unpacked2.ops, 0, function(op1, op2, opOut) {
-    if (op1.opcode == '+' || op2.opcode == '+') {
-      var whichToDo;
-      if (op2.opcode != '+') {
-	whichToDo = 1;
-      }
-      else if (op1.opcode != '+') {
-	whichToDo = 2;
-      }
-      else {
-	// both +
-	var firstChar1 = chars1.peek(1);
-	var firstChar2 = chars2.peek(1);
-        var insertFirst1 = hasInsertFirst(op1.attribs);
-        var insertFirst2 = hasInsertFirst(op2.attribs);
-        if (insertFirst1 && ! insertFirst2) {
-          whichToDo = 1;
-        }
-        else if (insertFirst2 && ! insertFirst1) {
-          whichToDo = 2;
-        }
-	// insert string that doesn't start with a newline first so as not to break up lines
-	else if (firstChar1 == '\n' && firstChar2 != '\n') {
-	  whichToDo = 2;
-	}
-	else if (firstChar1 != '\n' && firstChar2 == '\n') {
-	  whichToDo = 1;
-	}
-	// break symmetry:
-	else if (reverseInsertOrder) {
-	  whichToDo = 2;
-	}
-	else {
-	  whichToDo = 1;
-	}
-      }
-      if (whichToDo == 1) {
-	chars1.skip(op1.chars);
-	opOut.opcode = '=';
-	opOut.lines = op1.lines;
-	opOut.chars = op1.chars;
-	opOut.attribs = '';
-	op1.opcode = '';
-      }
-      else {
-	// whichToDo == 2
-	chars2.skip(op2.chars);
-	Changeset.copyOp(op2, opOut);
-	op2.opcode = '';
-      }
-    }
-    else if (op1.opcode == '-') {
-      if (! op2.opcode) {
-	op1.opcode = '';
-      }
-      else {
-	if (op1.chars <= op2.chars) {
-	  op2.chars -= op1.chars;
-	  op2.lines -= op1.lines;
-	  op1.opcode = '';
-	  if (! op2.chars) {
-	    op2.opcode = '';
-	  }
-	}
-	else {
-	  op1.chars -= op2.chars;
-	  op1.lines -= op2.lines;
-	  op2.opcode = '';
-	}
-      }
-    }
-    else if (op2.opcode == '-') {
-      Changeset.copyOp(op2, opOut);
-      if (! op1.opcode) {
-	op2.opcode = '';
-      }
-      else if (op2.chars <= op1.chars) {
-	// delete part or all of a keep
-	op1.chars -= op2.chars;
-	op1.lines -= op2.lines;
-	op2.opcode = '';
-	if (! op1.chars) {
-	  op1.opcode = '';
-	}
-      }
-      else {
-	// delete all of a keep, and keep going
-	opOut.lines = op1.lines;
-	opOut.chars = op1.chars;
-	op2.lines -= op1.lines;
-	op2.chars -= op1.chars;
-	op1.opcode = '';
-      }
-    }
-    else if (! op1.opcode) {
-      Changeset.copyOp(op2, opOut);
-      op2.opcode = '';
-    }
-    else if (! op2.opcode) {
-      Changeset.copyOp(op1, opOut);
-      op1.opcode = '';
-    }
-    else {
-      // both keeps
-      opOut.opcode = '=';
-      opOut.attribs = Changeset.followAttributes(op1.attribs, op2.attribs, pool);
-      if (op1.chars <= op2.chars) {
-	opOut.chars = op1.chars;
-	opOut.lines = op1.lines;
-	op2.chars -= op1.chars;
-	op2.lines -= op1.lines;
-	op1.opcode = '';
-	if (! op2.chars) {
-	  op2.opcode = '';
-	}
-      }
-      else {
-	opOut.chars = op2.chars;
-	opOut.lines = op2.lines;
-	op1.chars -= op2.chars;
-	op1.lines -= op2.lines;
-	op2.opcode = '';
-      }
-    }
-    switch (opOut.opcode) {
-    case '=': oldPos += opOut.chars; newLen += opOut.chars; break;
-    case '-': oldPos += opOut.chars; break;
-    case '+': newLen += opOut.chars; break;
-    }
-  });
-  newLen += oldLen - oldPos;
-
-  return Changeset.pack(oldLen, newLen, newOps, unpacked2.charBank);
-};
-
-Changeset.followAttributes = function(att1, att2, pool) {
-  // The merge of two sets of attribute changes to the same text
-  // takes the lexically-earlier value if there are two values
-  // for the same key.  Otherwise, all key/value changes from
-  // both attribute sets are taken.  This operation is the "follow",
-  // so a set of changes is produced that can be applied to att1
-  // to produce the merged set.
-  if ((! att2) || (! pool)) return '';
-  if (! att1) return att2;
-  var atts = [];
-  att2.replace(/\*([0-9a-z]+)/g, function(_, a) {
-    atts.push(pool.getAttrib(Changeset.parseNum(a)));
-    return '';
-  });
-  att1.replace(/\*([0-9a-z]+)/g, function(_, a) {
-    var pair1 = pool.getAttrib(Changeset.parseNum(a));
-    for(var i=0;i<atts.length;i++) {
-      var pair2 = atts[i];
-      if (pair1[0] == pair2[0]) {
-	if (pair1[1] <= pair2[1]) {
-	  // winner of merge is pair1, delete this attribute
-	  atts.splice(i, 1);
-	}
-	break;
-      }
-    }
-    return '';
-  });
-  // we've only removed attributes, so they're already sorted
-  var buf = Changeset.stringAssembler();
-  for(var i=0;i<atts.length;i++) {
-    buf.append('*');
-    buf.append(Changeset.numToString(pool.putAttrib(atts[i])));
-  }
-  return buf.toString();
-};
diff --git a/etherpad/src/etherpad/collab/ace/easysync2_tests.js b/etherpad/src/etherpad/collab/ace/easysync2_tests.js
deleted file mode 100644
index 7a23dc0..0000000
--- a/etherpad/src/etherpad/collab/ace/easysync2_tests.js
+++ /dev/null
@@ -1,877 +0,0 @@
-// DO NOT EDIT THIS FILE, edit infrastructure/ace/www/easysync2_tests.js
-import("etherpad.collab.ace.easysync2.*")
-
-/**
- * Copyright 2009 Google Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS-IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-function runTests() {
-
-  function print(str) {
-    java.lang.System.out.println(str);
-  }
-
-  function assert(code, optMsg) {
-    if (! eval(code)) throw new Error("FALSE: "+(optMsg || code));
-  }
-  function literal(v) {
-    if ((typeof v) == "string") {
-      return '"'+v.replace(/[\\\"]/g, '\\$1').replace(/\n/g, '\\n')+'"';
-    }
-    else return v.toSource();
-  }
-  function assertEqualArrays(a, b) {
-    assert(literal(a)+".toSource() == "+literal(b)+".toSource()");
-  }
-  function assertEqualStrings(a, b) {
-    assert(literal(a)+" == "+literal(b));
-  }
-
-  function throughIterator(opsStr) {
-    var iter = Changeset.opIterator(opsStr);
-    var assem = Changeset.opAssembler();
-    while (iter.hasNext()) {
-      assem.append(iter.next());
-    }
-    return assem.toString();
-  }
-
-  function throughSmartAssembler(opsStr) {
-    var iter = Changeset.opIterator(opsStr);
-    var assem = Changeset.smartOpAssembler();
-    while (iter.hasNext()) {
-      assem.append(iter.next());
-    }
-    assem.endDocument();
-    return assem.toString();
-  }
-
-  (function() {
-    print("> throughIterator");
-    var x = '-c*3*4+6|3=az*asdf0*1*2*3+1=1-1+1*0+1=1-1+1|c=c-1';
-    assert("throughIterator("+literal(x)+") == "+literal(x));
-  })();
-
-  (function() {
-    print("> throughSmartAssembler");
-    var x = '-c*3*4+6|3=az*asdf0*1*2*3+1=1-1+1*0+1=1-1+1|c=c-1';
-    assert("throughSmartAssembler("+literal(x)+") == "+literal(x));
-  })();
-
-  function applyMutations(mu, arrayOfArrays) {
-    arrayOfArrays.forEach(function (a) {
-      var result = mu[a[0]].apply(mu, a.slice(1));
-      if (a[0] == 'remove' && a[3]) {
-        assertEqualStrings(a[3], result);
-      }
-    });
-  }
-
-  function mutationsToChangeset(oldLen, arrayOfArrays) {
-    var assem = Changeset.smartOpAssembler();
-    var op = Changeset.newOp();
-    var bank = Changeset.stringAssembler();
-    var oldPos = 0;
-    var newLen = 0;
-    arrayOfArrays.forEach(function (a) {
-      if (a[0] == 'skip') {
-        op.opcode = '=';
-        op.chars = a[1];
-        op.lines = (a[2] || 0);
-        assem.append(op);
-        oldPos += op.chars;
-        newLen += op.chars;
-      }
-      else if (a[0] == 'remove') {
-        op.opcode = '-';
-        op.chars = a[1];
-        op.lines = (a[2] || 0);
-        assem.append(op);
-        oldPos += op.chars;
-      }
-      else if (a[0] == 'insert') {
-        op.opcode = '+';
-        bank.append(a[1]);
-        op.chars = a[1].length;
-        op.lines = (a[2] || 0);
-        assem.append(op);
-        newLen += op.chars;
-      }
-    });
-    newLen += oldLen - oldPos;
-    assem.endDocument();
-    return Changeset.pack(oldLen, newLen, assem.toString(),
-                          bank.toString());
-  }
-
-  function runMutationTest(testId, origLines, muts, correct) {
-    print("> runMutationTest#"+testId);
-    var lines = origLines.slice();
-    var mu = Changeset.textLinesMutator(lines);
-    applyMutations(mu, muts);
-    mu.close();
-    assertEqualArrays(correct, lines);
-
-    var inText = origLines.join('');
-    var cs = mutationsToChangeset(inText.length, muts);
-    lines = origLines.slice();
-    Changeset.mutateTextLines(cs, lines);
-    assertEqualArrays(correct, lines);
-
-    var correctText = correct.join('');
-    //print(literal(cs));
-    var outText = Changeset.applyToText(cs, inText);
-    assertEqualStrings(correctText, outText);
-  }
-
-  runMutationTest(1, ["apple\n", "banana\n", "cabbage\n", "duffle\n", "eggplant\n"],
-                  [['remove',1,0,"a"],['insert',"tu"],['remove',1,0,"p"],['skip',4,1],['skip',7,1],
-                   ['insert',"cream\npie\n",2],['skip',2],['insert',"bot"],['insert',"\n",1],
-                   ['insert',"bu"],['skip',3],['remove',3,1,"ge\n"],['remove',6,0,"duffle"]],
-                  ["tuple\n","banana\n","cream\n","pie\n", "cabot\n","bubba\n","eggplant\n"]);
-
-  runMutationTest(2, ["apple\n", "banana\n", "cabbage\n", "duffle\n", "eggplant\n"],
-                  [['remove',1,0,"a"],['remove',1,0,"p"],['insert',"tu"],['skip',11,2],
-                   ['insert',"cream\npie\n",2],['skip',2],['insert',"bot"],['insert',"\n",1],
-                   ['insert',"bu"],['skip',3],['remove',3,1,"ge\n"],['remove',6,0,"duffle"]],
-                  ["tuple\n","banana\n","cream\n","pie\n", "cabot\n","bubba\n","eggplant\n"]);
-
-  runMutationTest(3, ["apple\n", "banana\n", "cabbage\n", "duffle\n", "eggplant\n"],
-                  [['remove',6,1,"apple\n"],['skip',15,2],['skip',6],['remove',1,1,"\n"],
-                   ['remove',8,0,"eggplant"],['skip',1,1]],
-                  ["banana\n","cabbage\n","duffle\n"]);
-
-  runMutationTest(4, ["15\n"],
-                  [['skip',1],['insert',"\n2\n3\n4\n",4],['skip',2,1]],
-                  ["1\n","2\n","3\n","4\n","5\n"]);
-
-  runMutationTest(5, ["1\n","2\n","3\n","4\n","5\n"],
-                  [['skip',1],['remove',7,4,"\n2\n3\n4\n"],['skip',2,1]],
-                  ["15\n"]);
-
-  runMutationTest(6, ["123\n","abc\n","def\n","ghi\n","xyz\n"],
-                  [['insert',"0"],['skip',4,1],['skip',4,1],['remove',8,2,"def\nghi\n"],['skip',4,1]],
-                  ["0123\n", "abc\n", "xyz\n"]);
-
-  runMutationTest(7, ["apple\n", "banana\n", "cabbage\n", "duffle\n", "eggplant\n"],
-                  [['remove',6,1,"apple\n"],['skip',15,2,true],['skip',6,0,true],['remove',1,1,"\n"],
-                   ['remove',8,0,"eggplant"],['skip',1,1,true]],
-                  ["banana\n","cabbage\n","duffle\n"]);
-
-  function poolOrArray(attribs) {
-    if (attribs.getAttrib) {
-      return attribs; // it's already an attrib pool
-    }
-    else {
-      // assume it's an array of attrib strings to be split and added
-      var p = new AttribPool();
-      attribs.forEach(function (kv) { p.putAttrib(kv.split(',')); });
-      return p;
-    }
-  }
-
-  function runApplyToAttributionTest(testId, attribs, cs, inAttr, outCorrect) {
-    print("> applyToAttribution#"+testId);
-    var p = poolOrArray(attribs);
-    var result = Changeset.applyToAttribution(
-      Changeset.checkRep(cs), inAttr, p);
-    assertEqualStrings(outCorrect, result);
-  }
-
-  // turn c<b>a</b>ctus\n into a<b>c</b>tusabcd\n
-  runApplyToAttributionTest(1, ['bold,', 'bold,true'],
-                            "Z:7>3-1*0=1*1=1=3+4$abcd",
-                            "+1*1+1|1+5", "+1*1+1|1+8");
-
-  // turn "david\ngreenspan\n" into "<b>david\ngreen</b>\n"
-  runApplyToAttributionTest(2, ['bold,', 'bold,true'],
-                            "Z:g<4*1|1=6*1=5-4$",
-                            "|2+g", "*1|1+6*1+5|1+1");
-
-  (function() {
-    print("> mutatorHasMore");
-    var lines = ["1\n", "2\n", "3\n", "4\n"];
-    var mu;
-
-    mu = Changeset.textLinesMutator(lines);
-    assert(mu.hasMore()+' == true');
-    mu.skip(8,4);
-    assert(mu.hasMore()+' == false');
-    mu.close();
-    assert(mu.hasMore()+' == false');
-
-    // still 1,2,3,4
-    mu = Changeset.textLinesMutator(lines);
-    assert(mu.hasMore()+' == true');
-    mu.remove(2,1);
-    assert(mu.hasMore()+' == true');
-    mu.skip(2,1);
-    assert(mu.hasMore()+' == true');
-    mu.skip(2,1);
-    assert(mu.hasMore()+' == true');
-    mu.skip(2,1);
-    assert(mu.hasMore()+' == false');
-    mu.insert("5\n", 1);
-    assert(mu.hasMore()+' == false');
-    mu.close();
-    assert(mu.hasMore()+' == false');
-
-    // 2,3,4,5 now
-    mu = Changeset.textLinesMutator(lines);
-    assert(mu.hasMore()+' == true');
-    mu.remove(6,3);
-    assert(mu.hasMore()+' == true');
-    mu.remove(2,1);
-    assert(mu.hasMore()+' == false');
-    mu.insert("hello\n", 1);
-    assert(mu.hasMore()+' == false');
-    mu.close();
-    assert(mu.hasMore()+' == false');
-
-  })();
-
-  function runMutateAttributionTest(testId, attribs, cs, alines, outCorrect) {
-    print("> runMutateAttributionTest#"+testId);
-    var p = poolOrArray(attribs);
-    var alines2 = Array.prototype.slice.call(alines);
-    var result = Changeset.mutateAttributionLines(
-      Changeset.checkRep(cs), alines2, p);
-    assertEqualArrays(outCorrect, alines2);
-
-    print("> runMutateAttributionTest#"+testId+".applyToAttribution");
-    function removeQuestionMarks(a) { return a.replace(/\?/g, ''); }
-    var inMerged = Changeset.joinAttributionLines(alines.map(removeQuestionMarks));
-    var correctMerged = Changeset.joinAttributionLines(outCorrect.map(removeQuestionMarks));
-    var mergedResult = Changeset.applyToAttribution(cs, inMerged, p);
-    assertEqualStrings(correctMerged, mergedResult);
-  }
-
-  // turn 123\n 456\n 789\n into 123\n 4<b>5</b>6\n 789\n
-  runMutateAttributionTest(1, ["bold,true"], "Z:c>0|1=4=1*0=1$", ["|1+4", "|1+4", "|1+4"],
-                           ["|1+4", "+1*0+1|1+2", "|1+4"]);
-
-  // make a document bold
-  runMutateAttributionTest(2, ["bold,true"], "Z:c>0*0|3=c$", ["|1+4", "|1+4", "|1+4"],
-                           ["*0|1+4", "*0|1+4", "*0|1+4"]);
-
-  // clear bold on document
-  runMutateAttributionTest(3, ["bold,","bold,true"], "Z:c>0*0|3=c$",
-                           ["*1+1+1*1+1|1+1", "+1*1+1|1+2", "*1+1+1*1+1|1+1"],
-                           ["|1+4", "|1+4", "|1+4"]);
-
-  // add a character on line 3 of a document with 5 blank lines, and make sure
-  // the optimization that skips purely-kept lines is working; if any attribution string
-  // with a '?' is parsed it will cause an error.
-  runMutateAttributionTest(4, ['foo,bar','line,1','line,2','line,3','line,4','line,5'],
-                           "Z:5>1|2=2+1$x",
-                           ["?*1|1+1", "?*2|1+1", "*3|1+1", "?*4|1+1", "?*5|1+1"],
-                           ["?*1|1+1", "?*2|1+1", "+1*3|1+1", "?*4|1+1", "?*5|1+1"]);
-
-  var testPoolWithChars = (function() {
-    var p = new AttribPool();
-    p.putAttrib(['char','newline']);
-    for(var i=1;i<36;i++) {
-      p.putAttrib(['char',Changeset.numToString(i)]);
-    }
-    p.putAttrib(['char','']);
-    return p;
-  })();
-
-  // based on runMutationTest#1
-  runMutateAttributionTest(5, testPoolWithChars,
-                           "Z:11>7-2*t+1*u+1|2=b|2+a=2*b+1*o+1*t+1*0|1+1*b+1*u+1=3|1-3-6$"+
-                           "tucream\npie\nbot\nbu",
-                           ["*a+1*p+2*l+1*e+1*0|1+1",
-                            "*b+1*a+1*n+1*a+1*n+1*a+1*0|1+1",
-                            "*c+1*a+1*b+2*a+1*g+1*e+1*0|1+1",
-                            "*d+1*u+1*f+2*l+1*e+1*0|1+1",
-                            "*e+1*g+2*p+1*l+1*a+1*n+1*t+1*0|1+1"],
-                           ["*t+1*u+1*p+1*l+1*e+1*0|1+1",
-                            "*b+1*a+1*n+1*a+1*n+1*a+1*0|1+1",
-                            "|1+6",
-                            "|1+4",
-                            "*c+1*a+1*b+1*o+1*t+1*0|1+1",
-                            "*b+1*u+1*b+2*a+1*0|1+1",
-                            "*e+1*g+2*p+1*l+1*a+1*n+1*t+1*0|1+1"]);
-
-  // based on runMutationTest#3
-  runMutateAttributionTest(6, testPoolWithChars,
-                           "Z:11<f|1-6|2=f=6|1-1-8$",
-                           ["*a|1+6", "*b|1+7", "*c|1+8", "*d|1+7", "*e|1+9"],
-                           ["*b|1+7", "*c|1+8", "*d+6*e|1+1"]);
-
-  // based on runMutationTest#4
-  runMutateAttributionTest(7, testPoolWithChars,
-                           "Z:3>7=1|4+7$\n2\n3\n4\n",
-                           ["*1+1*5|1+2"],
-                           ["*1+1|1+1","|1+2","|1+2","|1+2","*5|1+2"]);
-
-  // based on runMutationTest#5
-  runMutateAttributionTest(8, testPoolWithChars,
-                           "Z:a<7=1|4-7$",
-                           ["*1|1+2","*2|1+2","*3|1+2","*4|1+2","*5|1+2"],
-                           ["*1+1*5|1+2"]);
-
-  // based on runMutationTest#6
-  runMutateAttributionTest(9, testPoolWithChars,
-                           "Z:k<7*0+1*10|2=8|2-8$0",
-                           ["*1+1*2+1*3+1|1+1","*a+1*b+1*c+1|1+1",
-                            "*d+1*e+1*f+1|1+1","*g+1*h+1*i+1|1+1","?*x+1*y+1*z+1|1+1"],
-                           ["*0+1|1+4", "|1+4", "?*x+1*y+1*z+1|1+1"]);
-
-  runMutateAttributionTest(10, testPoolWithChars,
-                           "Z:6>4=1+1=1+1|1=1+1=1*0+1$abcd",
-                           ["|1+3", "|1+3"],
-                           ["|1+5", "+2*0+1|1+2"]);
-
-
-  runMutateAttributionTest(11, testPoolWithChars,
-                           "Z:s>1|1=4=6|1+1$\n",
-                           ["*0|1+4", "*0|1+8", "*0+5|1+1", "*0|1+1", "*0|1+5", "*0|1+1", "*0|1+1", "*0|1+1", "|1+1"],
-                           ["*0|1+4", "*0+6|1+1", "*0|1+2", "*0+5|1+1", "*0|1+1", "*0|1+5", "*0|1+1", "*0|1+1", "*0|1+1", "|1+1"]);
-
-  function randomInlineString(len, rand) {
-    var assem = Changeset.stringAssembler();
-    for(var i=0;i<len;i++) {
-      assem.append(String.fromCharCode(rand.nextInt(26) + 97));
-    }
-    return assem.toString();
-  }
-
-  function randomMultiline(approxMaxLines, approxMaxCols, rand) {
-    var numParts = rand.nextInt(approxMaxLines*2)+1;
-    var txt = Changeset.stringAssembler();
-    txt.append(rand.nextInt(2) ? '\n' : '');
-    for(var i=0;i<numParts;i++) {
-      if ((i % 2) == 0) {
-        if (rand.nextInt(10)) {
-          txt.append(randomInlineString(rand.nextInt(approxMaxCols)+1, rand));
-        }
-        else {
-          txt.append('\n');
-        }
-      }
-      else {
-        txt.append('\n');
-      }
-    }
-    return txt.toString();
-  }
-
-  function randomStringOperation(numCharsLeft, rand) {
-    var result;
-    switch(rand.nextInt(9)) {
-    case 0: {
-      // insert char
-      result = {insert: randomInlineString(1, rand)};
-      break;
-    }
-    case 1: {
-      // delete char
-      result = {remove: 1};
-      break;
-    }
-    case 2: {
-      // skip char
-      result = {skip: 1};
-      break;
-    }
-    case 3: {
-      // insert small
-      result = {insert: randomInlineString(rand.nextInt(4)+1, rand)};
-      break;
-    }
-    case 4: {
-      // delete small
-      result = {remove: rand.nextInt(4)+1};
-      break;
-    }
-    case 5: {
-      // skip small
-      result = {skip: rand.nextInt(4)+1};
-      break;
-    }
-    case 6: {
-      // insert multiline;
-      result = {insert: randomMultiline(5, 20, rand)};
-      break;
-    }
-    case 7: {
-      // delete multiline
-      result = {remove: Math.round(numCharsLeft * rand.nextDouble() * rand.nextDouble()) };
-      break;
-    }
-    case 8: {
-      // skip multiline
-      result = {skip: Math.round(numCharsLeft * rand.nextDouble() * rand.nextDouble()) };
-      break;
-    }
-    case 9: {
-      // delete to end
-      result = {remove: numCharsLeft};
-      break;
-    }
-    case 10: {
-      // skip to end
-      result = {skip: numCharsLeft};
-      break;
-    }
-    }
-    var maxOrig = numCharsLeft - 1;
-    if ('remove' in result) {
-      result.remove = Math.min(result.remove, maxOrig);
-    }
-    else if ('skip' in result) {
-      result.skip = Math.min(result.skip, maxOrig);
-    }
-    return result;
-  }
-
-  function randomTwoPropAttribs(opcode, rand) {
-    // assumes attrib pool like ['apple,','apple,true','banana,','banana,true']
-    if (opcode == '-' || rand.nextInt(3)) {
-      return '';
-    }
-    else if (rand.nextInt(3)) {
-      if (opcode == '+' || rand.nextInt(2)) {
-        return '*'+Changeset.numToString(rand.nextInt(2)*2+1);
-      }
-      else {
-        return '*'+Changeset.numToString(rand.nextInt(2)*2);
-      }
-    }
-    else {
-      if (opcode == '+' || rand.nextInt(4) == 0) {
-        return '*1*3';
-      }
-      else {
-        return ['*0*2', '*0*3', '*1*2'][rand.nextInt(3)];
-      }
-    }
-  }
-
-  function randomTestChangeset(origText, rand, withAttribs) {
-    var charBank = Changeset.stringAssembler();
-    var textLeft = origText; // always keep final newline
-    var outTextAssem = Changeset.stringAssembler();
-    var opAssem = Changeset.smartOpAssembler();
-    var oldLen = origText.length;
-
-    var nextOp = Changeset.newOp();
-    function appendMultilineOp(opcode, txt) {
-      nextOp.opcode = opcode;
-      if (withAttribs) {
-        nextOp.attribs = randomTwoPropAttribs(opcode, rand);
-      }
-      txt.replace(/\n|[^\n]+/g, function (t) {
-        if (t == '\n') {
-          nextOp.chars = 1;
-          nextOp.lines = 1;
-          opAssem.append(nextOp);
-        }
-        else {
-          nextOp.chars = t.length;
-          nextOp.lines = 0;
-          opAssem.append(nextOp);
-        }
-        return '';
-      });
-    }
-
-    function doOp() {
-      var o = randomStringOperation(textLeft.length, rand);
-      if (o.insert) {
-        var txt = o.insert;
-        charBank.append(txt);
-        outTextAssem.append(txt);
-        appendMultilineOp('+', txt);
-      }
-      else if (o.skip) {
-        var txt = textLeft.substring(0, o.skip);
-        textLeft = textLeft.substring(o.skip);
-        outTextAssem.append(txt);
-        appendMultilineOp('=', txt);
-      }
-      else if (o.remove) {
-        var txt = textLeft.substring(0, o.remove);
-        textLeft = textLeft.substring(o.remove);
-        appendMultilineOp('-', txt);
-      }
-    }
-
-    while (textLeft.length > 1) doOp();
-    for(var i=0;i<5;i++) doOp(); // do some more (only insertions will happen)
-
-    var outText = outTextAssem.toString()+'\n';
-    opAssem.endDocument();
-    var cs = Changeset.pack(oldLen, outText.length, opAssem.toString(), charBank.toString());
-    Changeset.checkRep(cs);
-    return [cs, outText];
-  }
-
-  function testCompose(randomSeed) {
-    var rand = new java.util.Random(randomSeed);
-    print("> testCompose#"+randomSeed);
-
-    var p = new AttribPool();
-
-    var startText = randomMultiline(10, 20, rand)+'\n';
-
-    var x1 = randomTestChangeset(startText, rand);
-    var change1 = x1[0];
-    var text1 = x1[1];
-
-    var x2 = randomTestChangeset(text1, rand);
-    var change2 = x2[0];
-    var text2 = x2[1];
-
-    var x3 = randomTestChangeset(text2, rand);
-    var change3 = x3[0];
-    var text3 = x3[1];
-
-    //print(literal(Changeset.toBaseTen(startText)));
-    //print(literal(Changeset.toBaseTen(change1)));
-    //print(literal(Changeset.toBaseTen(change2)));
-    var change12 = Changeset.checkRep(Changeset.compose(change1, change2, p));
-    var change23 = Changeset.checkRep(Changeset.compose(change2, change3, p));
-    var change123 = Changeset.checkRep(Changeset.compose(change12, change3, p));
-    var change123a = Changeset.checkRep(Changeset.compose(change1, change23, p));
-    assertEqualStrings(change123, change123a);
-
-    assertEqualStrings(text2, Changeset.applyToText(change12, startText));
-    assertEqualStrings(text3, Changeset.applyToText(change23, text1));
-    assertEqualStrings(text3, Changeset.applyToText(change123, startText));
-  }
-
-  for(var i=0;i<30;i++) testCompose(i);
-
-  (function simpleComposeAttributesTest() {
-    print("> simpleComposeAttributesTest");
-    var p = new AttribPool();
-    p.putAttrib(['bold','']);
-    p.putAttrib(['bold','true']);
-    var cs1 = Changeset.checkRep("Z:2>1*1+1*1=1$x");
-    var cs2 = Changeset.checkRep("Z:3>0*0|1=3$");
-    var cs12 = Changeset.checkRep(Changeset.compose(cs1, cs2, p));
-    assertEqualStrings("Z:2>1+1*0|1=2$x", cs12);
-  })();
-
-  (function followAttributesTest() {
-    var p = new AttribPool();
-    p.putAttrib(['x','']);
-    p.putAttrib(['x','abc']);
-    p.putAttrib(['x','def']);
-    p.putAttrib(['y','']);
-    p.putAttrib(['y','abc']);
-    p.putAttrib(['y','def']);
-
-    function testFollow(a, b, afb, bfa, merge) {
-      assertEqualStrings(afb, Changeset.followAttributes(a, b, p));
-      assertEqualStrings(bfa, Changeset.followAttributes(b, a, p));
-      assertEqualStrings(merge, Changeset.composeAttributes(a, afb, true, p));
-      assertEqualStrings(merge, Changeset.composeAttributes(b, bfa, true, p));
-    }
-
-    testFollow('', '', '', '', '');
-    testFollow('*0', '', '', '*0', '*0');
-    testFollow('*0', '*0', '', '', '*0');
-    testFollow('*0', '*1', '', '*0', '*0');
-    testFollow('*1', '*2', '', '*1', '*1');
-    testFollow('*0*1', '', '', '*0*1', '*0*1');
-    testFollow('*0*4', '*2*3', '*3', '*0', '*0*3');
-    testFollow('*0*4', '*2', '', '*0*4', '*0*4');
-  })();
-
-  function testFollow(randomSeed) {
-    var rand = new java.util.Random(randomSeed + 1000);
-    print("> testFollow#"+randomSeed);
-
-    var p = new AttribPool();
-
-    var startText = randomMultiline(10, 20, rand)+'\n';
-
-    var cs1 = randomTestChangeset(startText, rand)[0];
-    var cs2 = randomTestChangeset(startText, rand)[0];
-
-    var afb = Changeset.checkRep(Changeset.follow(cs1, cs2, false, p));
-    var bfa = Changeset.checkRep(Changeset.follow(cs2, cs1, true, p));
-
-    var merge1 = Changeset.checkRep(Changeset.compose(cs1, afb));
-    var merge2 = Changeset.checkRep(Changeset.compose(cs2, bfa));
-
-    assertEqualStrings(merge1, merge2);
-  }
-
-  for(var i=0;i<30;i++) testFollow(i);
-
-  function testSplitJoinAttributionLines(randomSeed) {
-    var rand = new java.util.Random(randomSeed + 2000);
-    print("> testSplitJoinAttributionLines#"+randomSeed);
-
-    var doc = randomMultiline(10, 20, rand)+'\n';
-
-    function stringToOps(str) {
-      var assem = Changeset.mergingOpAssembler();
-      var o = Changeset.newOp('+');
-      o.chars = 1;
-      for(var i=0;i<str.length;i++) {
-        var c = str.charAt(i);
-        o.lines = (c == '\n' ? 1 : 0);
-        o.attribs = (c == 'a' || c == 'b' ? '*'+c : '');
-        assem.append(o);
-      }
-      return assem.toString();
-    }
-
-    var theJoined = stringToOps(doc);
-    var theSplit = doc.match(/[^\n]*\n/g).map(stringToOps);
-
-    assertEqualArrays(theSplit, Changeset.splitAttributionLines(theJoined, doc));
-    assertEqualStrings(theJoined, Changeset.joinAttributionLines(theSplit));
-  }
-
-  for(var i=0;i<10;i++) testSplitJoinAttributionLines(i);
-
-  (function testMoveOpsToNewPool() {
-    print("> testMoveOpsToNewPool");
-
-    var pool1 = new AttribPool();
-    var pool2 = new AttribPool();
-
-    pool1.putAttrib(['baz','qux']);
-    pool1.putAttrib(['foo','bar']);
-
-    pool2.putAttrib(['foo','bar']);
-
-    assertEqualStrings(Changeset.moveOpsToNewPool('Z:1>2*1+1*0+1$ab', pool1, pool2), 'Z:1>2*0+1*1+1$ab');
-    assertEqualStrings(Changeset.moveOpsToNewPool('*1+1*0+1', pool1, pool2), '*0+1*1+1');
-  })();
-
-
-  (function testMakeSplice() {
-    print("> testMakeSplice");
-
-    var t = "a\nb\nc\n";
-    var t2 = Changeset.applyToText(Changeset.makeSplice(t, 5, 0, "def"), t);
-    assertEqualStrings("a\nb\ncdef\n", t2);
-
-  })();
-
-  (function testToSplices() {
-    print("> testToSplices");
-
-    var cs = Changeset.checkRep('Z:z>9*0=1=4-3+9=1|1-4-4+1*0+a$123456789abcdefghijk');
-    var correctSplices = [[5, 8, "123456789"], [9, 17, "abcdefghijk"]];
-    assertEqualArrays(correctSplices, Changeset.toSplices(cs));
-  })();
-
-  function testCharacterRangeFollow(testId, cs, oldRange, insertionsAfter, correctNewRange) {
-    print("> testCharacterRangeFollow#"+testId);
-
-    var cs = Changeset.checkRep(cs);
-    assertEqualArrays(correctNewRange, Changeset.characterRangeFollow(cs, oldRange[0], oldRange[1],
-                                                                     insertionsAfter));
-
-  }
-
-  testCharacterRangeFollow(1, 'Z:z>9*0=1=4-3+9=1|1-4-4+1*0+a$123456789abcdefghijk',
-                           [7, 10],  false, [14, 15]);
-  testCharacterRangeFollow(2, "Z:bc<6|x=b4|2-6$", [400, 407], false, [400, 401]);
-  testCharacterRangeFollow(3, "Z:4>0-3+3$abc", [0,3], false, [3,3]);
-  testCharacterRangeFollow(4, "Z:4>0-3+3$abc", [0,3], true, [0,0]);
-  testCharacterRangeFollow(5, "Z:5>1+1=1-3+3$abcd", [1,4], false, [5,5]);
-  testCharacterRangeFollow(6, "Z:5>1+1=1-3+3$abcd", [1,4], true, [2,2]);
-  testCharacterRangeFollow(7, "Z:5>1+1=1-3+3$abcd", [0,6], false, [1,7]);
-  testCharacterRangeFollow(8, "Z:5>1+1=1-3+3$abcd", [0,3], false, [1,2]);
-  testCharacterRangeFollow(9, "Z:5>1+1=1-3+3$abcd", [2,5], false, [5,6]);
-  testCharacterRangeFollow(10, "Z:2>1+1$a", [0,0], false, [1,1]);
-  testCharacterRangeFollow(11, "Z:2>1+1$a", [0,0], true, [0,0]);
-
-  (function testOpAttributeValue() {
-    print("> testOpAttributeValue");
-
-    var p = new AttribPool();
-    p.putAttrib(['name','david']);
-    p.putAttrib(['color','green']);
-
-    assertEqualStrings("david", Changeset.opAttributeValue(Changeset.stringOp('*0*1+1'), 'name', p));
-    assertEqualStrings("david", Changeset.opAttributeValue(Changeset.stringOp('*0+1'), 'name', p));
-    assertEqualStrings("", Changeset.opAttributeValue(Changeset.stringOp('*1+1'), 'name', p));
-    assertEqualStrings("", Changeset.opAttributeValue(Changeset.stringOp('+1'), 'name', p));
-    assertEqualStrings("green", Changeset.opAttributeValue(Changeset.stringOp('*0*1+1'), 'color', p));
-    assertEqualStrings("green", Changeset.opAttributeValue(Changeset.stringOp('*1+1'), 'color', p));
-    assertEqualStrings("", Changeset.opAttributeValue(Changeset.stringOp('*0+1'), 'color', p));
-    assertEqualStrings("", Changeset.opAttributeValue(Changeset.stringOp('+1'), 'color', p));
-  })();
-
-  function testAppendATextToAssembler(testId, atext, correctOps) {
-    print("> testAppendATextToAssembler#"+testId);
-
-    var assem = Changeset.smartOpAssembler();
-    Changeset.appendATextToAssembler(atext, assem);
-    assertEqualStrings(correctOps, assem.toString());
-  }
-
-  testAppendATextToAssembler(1, {text:"\n", attribs:"|1+1"}, "");
-  testAppendATextToAssembler(2, {text:"\n\n", attribs:"|2+2"}, "|1+1");
-  testAppendATextToAssembler(3, {text:"\n\n", attribs:"*x|2+2"}, "*x|1+1");
-  testAppendATextToAssembler(4, {text:"\n\n", attribs:"*x|1+1|1+1"}, "*x|1+1");
-  testAppendATextToAssembler(5, {text:"foo\n", attribs:"|1+4"}, "+3");
-  testAppendATextToAssembler(6, {text:"\nfoo\n", attribs:"|2+5"}, "|1+1+3");
-  testAppendATextToAssembler(7, {text:"\nfoo\n", attribs:"*x|2+5"}, "*x|1+1*x+3");
-  testAppendATextToAssembler(8, {text:"\n\n\nfoo\n", attribs:"|2+2*x|2+5"}, "|2+2*x|1+1*x+3");
-
-  function testMakeAttribsString(testId, pool, opcode, attribs, correctString) {
-    print("> testMakeAttribsString#"+testId);
-
-    var p = poolOrArray(pool);
-    var str = Changeset.makeAttribsString(opcode, attribs, p);
-    assertEqualStrings(correctString, str);
-  }
-
-  testMakeAttribsString(1, ['bold,'], '+', [['bold','']], '');
-  testMakeAttribsString(2, ['abc,def','bold,'], '=', [['bold','']], '*1');
-  testMakeAttribsString(3, ['abc,def','bold,true'], '+', [['abc','def'],['bold','true']], '*0*1');
-  testMakeAttribsString(4, ['abc,def','bold,true'], '+', [['bold','true'],['abc','def']], '*0*1');
-
-  function testSubattribution(testId, astr, start, end, correctOutput) {
-    print("> testSubattribution#"+testId);
-
-    var str = Changeset.subattribution(astr, start, end);
-    assertEqualStrings(correctOutput, str);
-  }
-
-  testSubattribution(1, "+1", 0, 0, "");
-  testSubattribution(2, "+1", 0, 1, "+1");
-  testSubattribution(3, "+1", 0, undefined, "+1");
-  testSubattribution(4, "|1+1", 0, 0, "");
-  testSubattribution(5, "|1+1", 0, 1, "|1+1");
-  testSubattribution(6, "|1+1", 0, undefined, "|1+1");
-  testSubattribution(7, "*0+1", 0, 0, "");
-  testSubattribution(8, "*0+1", 0, 1, "*0+1");
-  testSubattribution(9, "*0+1", 0, undefined, "*0+1");
-  testSubattribution(10, "*0|1+1", 0, 0, "");
-  testSubattribution(11, "*0|1+1", 0, 1, "*0|1+1");
-  testSubattribution(12, "*0|1+1", 0, undefined, "*0|1+1");
-  testSubattribution(13, "*0+2+1*1+3", 0, 1, "*0+1");
-  testSubattribution(14, "*0+2+1*1+3", 0, 2, "*0+2");
-  testSubattribution(15, "*0+2+1*1+3", 0, 3, "*0+2+1");
-  testSubattribution(16, "*0+2+1*1+3", 0, 4, "*0+2+1*1+1");
-  testSubattribution(17, "*0+2+1*1+3", 0, 5, "*0+2+1*1+2");
-  testSubattribution(18, "*0+2+1*1+3", 0, 6, "*0+2+1*1+3");
-  testSubattribution(19, "*0+2+1*1+3", 0, 7, "*0+2+1*1+3");
-  testSubattribution(20, "*0+2+1*1+3", 0, undefined, "*0+2+1*1+3");
-  testSubattribution(21, "*0+2+1*1+3", 1, undefined, "*0+1+1*1+3");
-  testSubattribution(22, "*0+2+1*1+3", 2, undefined, "+1*1+3");
-  testSubattribution(23, "*0+2+1*1+3", 3, undefined, "*1+3");
-  testSubattribution(24, "*0+2+1*1+3", 4, undefined, "*1+2");
-  testSubattribution(25, "*0+2+1*1+3", 5, undefined, "*1+1");
-  testSubattribution(26, "*0+2+1*1+3", 6, undefined, "");
-  testSubattribution(27, "*0+2+1*1|1+3", 0, 1, "*0+1");
-  testSubattribution(28, "*0+2+1*1|1+3", 0, 2, "*0+2");
-  testSubattribution(29, "*0+2+1*1|1+3", 0, 3, "*0+2+1");
-  testSubattribution(30, "*0+2+1*1|1+3", 0, 4, "*0+2+1*1+1");
-  testSubattribution(31, "*0+2+1*1|1+3", 0, 5, "*0+2+1*1+2");
-  testSubattribution(32, "*0+2+1*1|1+3", 0, 6, "*0+2+1*1|1+3");
-  testSubattribution(33, "*0+2+1*1|1+3", 0, 7, "*0+2+1*1|1+3");
-  testSubattribution(34, "*0+2+1*1|1+3", 0, undefined, "*0+2+1*1|1+3");
-  testSubattribution(35, "*0+2+1*1|1+3", 1, undefined, "*0+1+1*1|1+3");
-  testSubattribution(36, "*0+2+1*1|1+3", 2, undefined, "+1*1|1+3");
-  testSubattribution(37, "*0+2+1*1|1+3", 3, undefined, "*1|1+3");
-  testSubattribution(38, "*0+2+1*1|1+3", 4, undefined, "*1|1+2");
-  testSubattribution(39, "*0+2+1*1|1+3", 5, undefined, "*1|1+1");
-  testSubattribution(40, "*0+2+1*1|1+3", 1, 5, "*0+1+1*1+2");
-  testSubattribution(41, "*0+2+1*1|1+3", 2, 6, "+1*1|1+3");
-  testSubattribution(42, "*0+2+1*1+3", 2, 6, "+1*1+3");
-
-  function testFilterAttribNumbers(testId, cs, filter, correctOutput) {
-    print("> testFilterAttribNumbers#"+testId);
-
-    var str = Changeset.filterAttribNumbers(cs, filter);
-    assertEqualStrings(correctOutput, str);
-  }
-
-  testFilterAttribNumbers(1, "*0*1+1+2+3*1+4*2+5*0*2*1*b*c+6",
-                          function(n) { return (n%2) == 0; },
-                          "*0+1+2+3+4*2+5*0*2*c+6");
-  testFilterAttribNumbers(2, "*0*1+1+2+3*1+4*2+5*0*2*1*b*c+6",
-                          function(n) { return (n%2) == 1; },
-                          "*1+1+2+3*1+4+5*1*b+6");
-
-  function testInverse(testId, cs, lines, alines, pool, correctOutput) {
-    print("> testInverse#"+testId);
-
-    pool = poolOrArray(pool);
-    var str = Changeset.inverse(Changeset.checkRep(cs), lines, alines, pool);
-    assertEqualStrings(correctOutput, str);
-  }
-
-  // take "FFFFTTTTT" and apply "-FT--FFTT", the inverse of which is "--F--TT--"
-  testInverse(1, "Z:9>0=1*0=1*1=1=2*0=2*1|1=2$", null, ["+4*1+5"], ['bold,','bold,true'],
-              "Z:9>0=2*0=1=2*1=2$");
-
-  function testMutateTextLines(testId, cs, lines, correctLines) {
-    print("> testMutateTextLines#"+testId);
-
-    var a = lines.slice();
-    Changeset.mutateTextLines(cs, a);
-    assertEqualArrays(correctLines, a);
-  }
-
-  testMutateTextLines(1, "Z:4<1|1-2-1|1+1+1$\nc", ["a\n", "b\n"], ["\n", "c\n"]);
-  testMutateTextLines(2, "Z:4>0|1-2-1|2+3$\nc\n", ["a\n", "b\n"], ["\n", "c\n", "\n"]);
-
-  function testInverseRandom(randomSeed) {
-    var rand = new java.util.Random(randomSeed + 3000);
-    print("> testInverseRandom#"+randomSeed);
-
-    var p = poolOrArray(['apple,','apple,true','banana,','banana,true']);
-
-    var startText = randomMultiline(10, 20, rand)+'\n';
-    var alines = Changeset.splitAttributionLines(Changeset.makeAttribution(startText), startText);
-    var lines = startText.slice(0,-1).split('\n').map(function(s) { return s+'\n'; });
-
-    var stylifier = randomTestChangeset(startText, rand, true)[0];
-
-    //print(alines.join('\n'));
-    Changeset.mutateAttributionLines(stylifier, alines, p);
-    //print(stylifier);
-    //print(alines.join('\n'));
-    Changeset.mutateTextLines(stylifier, lines);
-
-    var changeset = randomTestChangeset(lines.join(''), rand, true)[0];
-    var inverseChangeset = Changeset.inverse(changeset, lines, alines, p);
-
-    var origLines = lines.slice();
-    var origALines = alines.slice();
-
-    Changeset.mutateTextLines(changeset, lines);
-    Changeset.mutateAttributionLines(changeset, alines, p);
-    //print(origALines.join('\n'));
-    //print(changeset);
-    //print(inverseChangeset);
-    //print(origLines.map(function(s) { return '1: '+s.slice(0,-1); }).join('\n'));
-    //print(lines.map(function(s) { return '2: '+s.slice(0,-1); }).join('\n'));
-    //print(alines.join('\n'));
-    Changeset.mutateTextLines(inverseChangeset, lines);
-    Changeset.mutateAttributionLines(inverseChangeset, alines, p);
-    //print(lines.map(function(s) { return '3: '+s.slice(0,-1); }).join('\n'));
-
-    assertEqualArrays(origLines, lines);
-    assertEqualArrays(origALines, alines);
-  }
-
-  for(var i=0;i<30;i++) testInverseRandom(i);
-}
\ No newline at end of file
diff --git a/etherpad/src/etherpad/collab/ace/linestylefilter.js b/etherpad/src/etherpad/collab/ace/linestylefilter.js
deleted file mode 100644
index ffc8034..0000000
--- a/etherpad/src/etherpad/collab/ace/linestylefilter.js
+++ /dev/null
@@ -1,247 +0,0 @@
-// DO NOT EDIT THIS FILE, edit infrastructure/ace/www/linestylefilter.js
-import("etherpad.collab.ace.easysync2.Changeset");
-
-/**
- * Copyright 2009 Google Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS-IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-// requires: easysync2.Changeset
-
-var linestylefilter = {};
-
-linestylefilter.ATTRIB_CLASSES = {
-  'bold':'tag:b',
-  'italic':'tag:i',
-  'underline':'tag:u',
-  'strikethrough':'tag:s'
-};
-
-linestylefilter.getAuthorClassName = function(author) {
-  return "author-"+author.replace(/[^a-y0-9]/g, function(c) {
-    if (c == ".") return "-";
-    return 'z'+c.charCodeAt(0)+'z';
-  });
-};
-
-// lineLength is without newline; aline includes newline,
-// but may be falsy if lineLength == 0
-linestylefilter.getLineStyleFilter = function(lineLength, aline,
-                                              textAndClassFunc, apool) {
-
-  if (lineLength == 0) return textAndClassFunc;
-
-  var nextAfterAuthorColors = textAndClassFunc;
-
-  var authorColorFunc = (function() {
-    var lineEnd = lineLength;
-    var curIndex = 0;
-    var extraClasses;
-    var leftInAuthor;
-
-    function attribsToClasses(attribs) {
-      var classes = '';
-      Changeset.eachAttribNumber(attribs, function(n) {
-	var key = apool.getAttribKey(n);
-	if (key) {
-	  var value = apool.getAttribValue(n);
-	  if (value) {
-	    if (key == 'author') {
-	      classes += ' '+linestylefilter.getAuthorClassName(value);
-	    }
-            else if (key == 'list') {
-              classes += ' list:'+value;
-            }
-	    else if (linestylefilter.ATTRIB_CLASSES[key]) {
-	      classes += ' '+linestylefilter.ATTRIB_CLASSES[key];
-	    }
-	  }
-	}
-      });
-      return classes.substring(1);
-    }
-
-    var attributionIter = Changeset.opIterator(aline);
-    var nextOp, nextOpClasses;
-    function goNextOp() {
-      nextOp = attributionIter.next();
-      nextOpClasses = (nextOp.opcode && attribsToClasses(nextOp.attribs));
-    }
-    goNextOp();
-    function nextClasses() {
-      if (curIndex < lineEnd) {
-	extraClasses = nextOpClasses;
-	leftInAuthor = nextOp.chars;
-	goNextOp();
-	while (nextOp.opcode && nextOpClasses == extraClasses) {
-	  leftInAuthor += nextOp.chars;
-	  goNextOp();
-	}
-      }
-    }
-    nextClasses();
-
-    return function(txt, cls) {
-      while (txt.length > 0) {
-	if (leftInAuthor <= 0) {
-	  // prevent infinite loop if something funny's going on
-	  return nextAfterAuthorColors(txt, cls);
-	}
-	var spanSize = txt.length;
-	if (spanSize > leftInAuthor) {
-	  spanSize = leftInAuthor;
-	}
-	var curTxt = txt.substring(0, spanSize);
-	txt = txt.substring(spanSize);
-	nextAfterAuthorColors(curTxt, (cls&&cls+" ")+extraClasses);
-	curIndex += spanSize;
-	leftInAuthor -= spanSize;
-	if (leftInAuthor == 0) {
-	  nextClasses();
-	}
-      }
-    };
-  })();
-  return authorColorFunc;
-};
-
-linestylefilter.getAtSignSplitterFilter = function(lineText,
-                                                   textAndClassFunc) {
-  var at = /@/g;
-  at.lastIndex = 0;
-  var splitPoints = null;
-  var execResult;
-  while ((execResult = at.exec(lineText))) {
-    if (! splitPoints) {
-      splitPoints = [];
-    }
-    splitPoints.push(execResult.index);
-  }
-
-  if (! splitPoints) return textAndClassFunc;
-
-  return linestylefilter.textAndClassFuncSplitter(textAndClassFunc,
-                                                  splitPoints);
-};
-
-linestylefilter.REGEX_WORDCHAR = /[\u0030-\u0039\u0041-\u005A\u0061-\u007A\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u00FF\u0100-\u1FFF\u3040-\u9FFF\uF900-\uFDFF\uFE70-\uFEFE\uFF10-\uFF19\uFF21-\uFF3A\uFF41-\uFF5A\uFF66-\uFFDC]/;
-linestylefilter.REGEX_URLCHAR = new RegExp('('+/[-:@a-zA-Z0-9_.,~%+\/\\?=&#;()$]/.source+'|'+linestylefilter.REGEX_WORDCHAR.source+')');
-linestylefilter.REGEX_URL = new RegExp(/(?:(?:https?|s?ftp|ftps|file|smb|afp|nfs|(x-)?man|gopher|txmt):\/\/|mailto:)/.source+linestylefilter.REGEX_URLCHAR.source+'*(?![:.,;])'+linestylefilter.REGEX_URLCHAR.source, 'g');
-
-linestylefilter.getURLFilter = function(lineText, textAndClassFunc) {
-  linestylefilter.REGEX_URL.lastIndex = 0;
-  var urls = null;
-  var splitPoints = null;
-  var execResult;
-  while ((execResult = linestylefilter.REGEX_URL.exec(lineText))) {
-    if (! urls) {
-      urls = [];
-      splitPoints = [];
-    }
-    var startIndex = execResult.index;
-    var url = execResult[0];
-    urls.push([startIndex, url]);
-    splitPoints.push(startIndex, startIndex + url.length);
-  }
-
-  if (! urls) return textAndClassFunc;
-
-  function urlForIndex(idx) {
-    for(var k=0; k<urls.length; k++) {
-      var u = urls[k];
-      if (idx >= u[0] && idx < u[0]+u[1].length) {
-	return u[1];
-      }
-    }
-    return false;
-  }
-
-  var handleUrlsAfterSplit = (function() {
-    var curIndex = 0;
-    return function(txt, cls) {
-      var txtlen = txt.length;
-      var newCls = cls;
-      var url = urlForIndex(curIndex);
-      if (url) {
-	newCls += " url:"+url;
-      }
-      textAndClassFunc(txt, newCls);
-      curIndex += txtlen;
-    };
-  })();
-
-  return linestylefilter.textAndClassFuncSplitter(handleUrlsAfterSplit,
-                                                  splitPoints);
-};
-
-linestylefilter.textAndClassFuncSplitter = function(func, splitPointsOpt) {
-  var nextPointIndex = 0;
-  var idx = 0;
-
-  // don't split at 0
-  while (splitPointsOpt &&
-	 nextPointIndex < splitPointsOpt.length &&
-	 splitPointsOpt[nextPointIndex] == 0) {
-    nextPointIndex++;
-  }
-
-  function spanHandler(txt, cls) {
-    if ((! splitPointsOpt) || nextPointIndex >= splitPointsOpt.length) {
-      func(txt, cls);
-      idx += txt.length;
-    }
-    else {
-      var splitPoints = splitPointsOpt;
-      var pointLocInSpan = splitPoints[nextPointIndex] - idx;
-      var txtlen = txt.length;
-      if (pointLocInSpan >= txtlen) {
-	func(txt, cls);
-	idx += txt.length;
-	if (pointLocInSpan == txtlen) {
-	  nextPointIndex++;
-	}
-      }
-      else {
-	if (pointLocInSpan > 0) {
-	  func(txt.substring(0, pointLocInSpan), cls);
-	  idx += pointLocInSpan;
-	}
-	nextPointIndex++;
-	// recurse
-	spanHandler(txt.substring(pointLocInSpan), cls);
-      }
-    }
-  }
-  return spanHandler;
-};
-
-// domLineObj is like that returned by domline.createDomLine
-linestylefilter.populateDomLine = function(textLine, aline, apool,
-                                           domLineObj) {
-  // remove final newline from text if any
-  var text = textLine;
-  if (text.slice(-1) == '\n') {
-    text = text.substring(0, text.length-1);
-  }
-
-  function textAndClassFunc(tokenText, tokenClass) {
-    domLineObj.appendSpan(tokenText, tokenClass);
-  }
-
-  var func = textAndClassFunc;
-  func = linestylefilter.getURLFilter(text, func);
-  func = linestylefilter.getLineStyleFilter(text.length, aline,
-                                            func, apool);
-  func(text, '');
-};
diff --git a/etherpad/src/static/js/ace.js b/etherpad/src/static/js/ace.js
deleted file mode 100644
index 7f19d37..0000000
--- a/etherpad/src/static/js/ace.js
+++ /dev/null
@@ -1,29 +0,0 @@
-Ace2Editor.registry={nextId:1};function Ace2Editor(){var K="Ace2Editor";var F=Ace2Editor;var B={};var A={editor:B,id:(F.registry.nextId++)};
-var D=false;var E=[];function C(R,Q){return function(){var T=this;var S=arguments;function U(){R.apply(T,S);
-}if(Q){Q.apply(T,S);}if(D){U();}else{E.push(U);}};}function I(){for(var Q=0;Q<E.length;Q++){E[Q]();}E=[];
-}F.registry[A.id]=A;B.importText=C(function(R,Q){A.ace_importText(R,Q);});B.importAText=C(function(R,S,Q){A.ace_importAText(R,S,Q);
-});B.exportText=function(){if(!D){return"(awaiting init)\n";}return A.ace_exportText();};B.getFrame=function(){return A.frame||null;
-};B.focus=C(function(){A.ace_focus();});B.adjustSize=C(function(){var R=A.frame.parentNode;var Q=R.clientHeight;
-A.frame.style.height=(Q?Q+"px":R.style.height);A.ace_editorChangedSize();});B.setEditable=C(function(Q){A.ace_setEditable(Q);
-});B.getFormattedCode=function(){return A.ace_getFormattedCode();};B.setOnKeyPress=C(function(Q){A.ace_setOnKeyPress(Q);
-});B.setOnKeyDown=C(function(Q){A.ace_setOnKeyDown(Q);});B.setNotifyDirty=C(function(Q){A.ace_setNotifyDirty(Q);
-});B.setProperty=C(function(Q,R){A.ace_setProperty(Q,R);});B.getDebugProperty=function(Q){return A.ace_getDebugProperty(Q);
-};B.setBaseText=C(function(Q){A.ace_setBaseText(Q);});B.setBaseAttributedText=C(function(R,Q){A.ace_setBaseAttributedText(R,Q);
-});B.applyChangesToBase=C(function(R,Q,S){A.ace_applyChangesToBase(R,Q,S);});B.prepareUserChangeset=function(){if(!D){return null;
-}return A.ace_prepareUserChangeset();};B.applyPreparedChangesetToBase=C(function(){A.ace_applyPreparedChangesetToBase();
-});B.setUserChangeNotificationCallback=C(function(Q){A.ace_setUserChangeNotificationCallback(Q);});B.setAuthorInfo=C(function(R,Q){A.ace_setAuthorInfo(R,Q);
-});B.setAuthorSelectionRange=C(function(R,S,Q){A.ace_setAuthorSelectionRange(R,S,Q);});B.getUnhandledErrors=function(){if(!D){return[];
-}return A.ace_getUnhandledErrors();};B.execCommand=C(function(R,Q){A.ace_execCommand(R,Q);});var H=function(Q){return'<link rel="stylesheet" type="text/css" href="'+Q+'"/>';
-};var J=function(Q){return'\x3cscript type="text/javascript" src="'+Q+'">\x3c/script>';};var M=J;var N=H;
-var L=function(Q){return'\'<link rel="stylesheet" type="text/css" href="'+Q+"\"/>'";};var G=function(Q){return'\'\\x3cscript type="text/javascript" src="'+Q+"\">\\x3c/script>'";
-};var P=G;var O=L;B.destroy=C(function(){A.ace_dispose();A.frame.parentNode.removeChild(A.frame);delete F.registry[A.id];
-A=null;});B.init=function(Q,S,R){B.importText(S);A.onEditorReady=function(){D=true;I();R();};(function(){var W='<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">';
-var T=["'"+W+"<html><head>'"];T.push(("('<style type=\"text/css\">'+'body{margin:0;white-space:nowrap;}#outerdocbody{background-color:#fff;}body.grayedout{background-color:#eee!important;}#innerdocbody{font-size:12px;font-family:monospace;line-height:16px;}body.doesWrap{white-space:normal;}#innerdocbody{padding-top:1px;padding-right:10px;padding-bottom:8px;padding-left:1px;overflow:hidden;background-image:url(data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==);}#sidediv{font-size:11px;font-family:monospace;line-height:16px;padding-top:8px;padding-right:3px;position:absolute;width:20px;top:0;left:0;cursor:default;color:white;}#sidedivinner{text-align:right;}.sidedivdelayed{background-color:#eee;color:#888!important;border-right:1px solid #999;}.sidedivhidden{display:none;}#outerdocbody iframe{display:block;position:relative;left:32px;top:7px;border:0;width:1px;height:1px;}#outerdocbody .hotrect{border:1px solid #999;position:absolute;}body.mozilla,body.safari{display:table-cell;}body.doesWrap{display:block!important;}.safari div{padding-right:1px;}p{margin:0;}#linemetricsdiv{position:absolute;left:-1000px;top:-1000px;color:white;z-index:-1;font-size:12px;font-family:monospace;}#overlaysdiv{position:absolute;left:-1000px;top:-1000px;}.syntax .c{color:#bd3f00;font-style:italic;}.syntax .o{font-weight:bold;}.syntax .p{font-weight:bold;}.syntax .k{color:blue;}.syntax .kc{color:purple;}.syntax .mf{color:purple;}.syntax .mh{color:purple;}.syntax .mi{color:purple;}.syntax .sr{color:purple;}.syntax .s2{color:purple;}.syntax .s1{color:purple;}.syntax .sd{color:purple;}.syntax .cs{color:#0a3;font-weight:bold;font-style:italic;}.syntax .err{color:#c00;font-weight:bold;text-decoration:underline;}.syntax .nt{font-weight:bold;}.syntax .nc{color:#336;}.syntax .nf{color:#336;}.syntax .nd{color:#999;}.syntax .m{color:purple;}.syntax .nb{color:purple;}.syntax .cp{color:#bd3f00;}.syntax .flash{background-color:#adf!important;}.syntax .flashbad{background-color:#f55!important;}html{cursor:text;}span{cursor:auto;}a{cursor:pointer!important;}ul,ol,li{padding:0;margin:0;}ul{margin-left:1.5em;}ul ul{margin-left:0!important;}ul.list-bullet1{margin-left:1.5em;}ul.list-bullet2{margin-left:3em;}ul.list-bullet3{margin-left:4.5em;}ul.list-bullet4{margin-left:6em;}ul.list-bullet5{margin-left:7.5em;}ul.list-bullet6{margin-left:9em;}ul.list-bullet7{margin-left:10.5em;}ul.list-bullet8{margin-left:12em;}ul{list-style-type:disc;}ul.list-bullet1{list-style-type:disc;}ul.list-bullet2{list-style-type:circle;}ul.list-bullet3{list-style-type:square;}ul.list-bullet4{list-style-type:disc;}ul.list-bullet5{list-style-type:circle;}ul.list-bullet6{list-style-type:square;}ul.list-bullet7{list-style-type:disc;}ul.list-bullet8{list-style-type:circle;}'+'\\x3c/style>')"));
-T.push(('(\'\\x3cscript type="text/javascript">//<!--\\n\'+\'function isNodeText(A){return(A.nodeType==3);}function object(B){var A=function(){};A.prototype=B;return new A();\\n}function extend(C,A){for(var B in A){C[B]=A[B];}return C;}function forEach(B,D){for(var A=0;A\\x3cB.length;\\nA++){var C=D(B[A],A);if(C){break;}}}function map(C,D){var B=[];for(var A=0;A\\x3cC.length;A++){if(D){B.push(D(C[A],A));\\n}else{B.push(C[A]);}}return B;}function filter(B,D){var C=[];for(var A=0;A\\x3cB.length;A++){if(D(B[A],A)){C.push(B[A]);\\n}}return C;}function isArray(A){return A&&typeof A==="object"&&!(A.propertyIsEnumerable("length"))&&typeof A.length==="number";\\n}var userAgent=navigator.userAgent.toLowerCase();var browser={version:(userAgent.match(/.+(?:rv|it|ra|ie)[\\\\\\x2f: 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Q=P.lastIndexOf("\\\\n");if(Q\\x3c0){O.chars=P.length;O.lines=0;\\nD(O);}else{O.chars=Q+1;O.lines=P.match(/\\\\n/g).length;D(O);O.chars=P.length-(Q+1);O.lines=0;D(O);}}function K(){I();\\nH();return A.toString();}function N(){G.clear();E.clear();B.clear();A.clear();F=0;}function L(){B.endDocument();\\n}function J(){return F;}return{append:D,toString:K,clear:N,endDocument:L,appendOpWithText:M,getLengthChange:J};\\n};if(_opt){Changeset.mergingOpAssembler=function(){var A=_opt.mergingOpAssembler();function C(F){A.append(F.opcode,F.chars,F.lines,F.attribs);\\n}function E(){return A.toString();}function B(){A.clear();}function D(){A.endDocument();}return{append:C,toString:E,clear:B,endDocument:D};\\n};}else{Changeset.mergingOpAssembler=function(){var C=Changeset.opAssembler();var A=Changeset.newOp();\\nvar B=0;function D(I){if(A.opcode){if(I&&A.opcode=="="&&!A.attribs){}else{C.append(A);if(B){A.chars=B;\\nA.lines=0;C.append(A);B=0;}}A.opcode="";}}function F(I){if(I.chars>0){if(A.opcode==I.opcode&&A.attribs==I.attribs){if(I.lines>0){A.chars+=B+I.chars;\\nA.lines+=I.lines;B=0;}else{if(A.lines==0){A.chars+=I.chars;}else{B+=I.chars;}}}else{D();Changeset.copyOp(I,A);\\n}}}function G(){D(true);}function H(){D();return C.toString();}function E(){C.clear();Changeset.clearOp(A);\\n}return{append:F,toString:H,clear:E,endDocument:G};};}if(_opt){Changeset.opAssembler=function(){var A=_opt.opAssembler();\\nfunction C(E){A.append(E.opcode,E.chars,E.lines,E.attribs);}function D(){return A.toString();}function B(){A.clear();\\n}return{append:C,toString:D,clear:B};};}else{Changeset.opAssembler=function(){var A=[];function C(E){A.push(E.attribs);\\nif(E.lines){A.push("|",Changeset.numToString(E.lines));}A.push(E.opcode);A.push(Changeset.numToString(E.chars));\\n}function D(){return A.join("");}function B(){A.length=0;}return{append:C,toString:D,clear:B};};}Changeset.stringIterator=function(D){var A=0;\\nfunction B(H){Changeset.assert(H\\x3c=C(),"!(",H," \\x3c= ",C(),")");}function F(H){B(H);var I=D.substr(A,H);\\nA+=H;return I;}function E(H){B(H);var I=D.substr(A,H);return I;}function G(H){B(H);A+=H;}function C(){return D.length-A;\\n}return{take:F,skip:G,remaining:C,peek:E};};Changeset.stringAssembler=function(){var A=[];function B(D){A.push(String(D));\\n}function C(){return A.join("");}return{append:B,toString:C};};Changeset.textLinesMutator=function(C){var A=[0,0];\\nvar D=false;var E=0,B=0;function O(X){C.splice.apply(C,X);}function S(){return C.toSource();}function J(X){if(C.get){return C.get(X);\\n}else{return C[X];}}function U(Y,X){if(C.slice){return C.slice(Y,X);}else{return[];}}function T(){if((typeof C.length)=="number"){return C.length;\\n}else{return C.length();}}function G(){A[0]=E;A[1]=0;if(B>0){F();}D=true;}function K(){O(A);A.length=2;\\nA[0]=A[1]=0;D=false;}function H(){return(E-A[0]\\x3c(A.length-2));}function W(X){print(X+": "+A.toSource()+" / "+E+","+B+" / "+S());\\n}function F(){if(!H()){A.push(J(A[0]+A[1]));A[1]++;}return 2+E-A[0];}function L(X,Z){if(X){if(Z){if(!D){G();\\n}for(var Y=0;Y\\x3cX;Y++){B=0;F();E++;}}else{if(D){if(X>1){K();}else{F();}}E+=X;B=0;}}}function R(Z,Y,X){if(Z){if(Y){L(Y,X);\\n}else{if(X&&!D){G();}if(D){F();}B+=Z;}}}function I(X){var Y="";if(X){if(!D){G();}function a(c){var b=A[0]+A[1];\\nreturn U(b,b+c).join("");}if(H()){if(B==0){Y=A[A.length-1];A.length--;Y+=a(X-1);A[1]+=X-1;}else{Y=a(X-1);\\nA[1]+=X-1;var Z=A.length-1;Y=A[Z].substring(B)+Y;A[Z]=A[Z].substring(0,B)+J(A[0]+A[1]);A[1]+=1;}}else{Y=a(X);\\nA[1]+=X;}}return Y;}function V(Y,Z){var a="";if(Y){if(Z){return I(Z);}else{if(!D){G();}var X=F();a=A[X].substring(B,B+Y);\\nA[X]=A[X].substring(0,B)+A[X].substring(B+Y);}}return a;}function M(Z,c){if(Z){if(!D){G();}if(c){var X=Changeset.splitTextLines(Z);\\nif(H()){var Y=A.length-1;var a=A[Y];var b=B;A[Y]=a.substring(0,b)+X[0];E++;X.splice(0,1);Array.prototype.push.apply(A,X);\\nE+=X.length;A.push(a.substring(b));B=0;}else{Array.prototype.push.apply(A,X);E+=X.length;}}else{var Y=F();\\nA[Y]=A[Y].substring(0,B)+Z+A[Y].substring(B);B+=Z.length;}}}function N(){var X=T();if(D){X+=A.length-2-A[1];\\n}return E\\x3cX;}function P(){if(D){K();}}var Q={skip:R,remove:V,insert:M,close:P,hasMore:N,removeLines:I,skipLines:L};\\nreturn Q;};Changeset.applyZip=function(I,K,H,J,G){var F=Changeset.opIterator(I,K);var E=Changeset.opIterator(H,J);\\nvar D=Changeset.smartOpAssembler();var A=Changeset.newOp();var C=Changeset.newOp();var B=Changeset.newOp();\\nwhile(A.opcode||F.hasNext()||C.opcode||E.hasNext()){if((!A.opcode)&&F.hasNext()){F.next(A);}if((!C.opcode)&&E.hasNext()){E.next(C);\\n}G(A,C,B);if(B.opcode){D.append(B);B.opcode="";}}D.endDocument();return D.toString();};Changeset.unpack=function(B){var G=/Z:([0-9a-z]+)([>\\x3c])([0-9a-z]+)|/;\\nvar A=G.exec(B);if((!A)||(!A[0])){Changeset.error("Not a changeset: "+B);}var D=Changeset.parseNum(A[1]);\\nvar E=(A[2]==">")?1:-1;var H=Changeset.parseNum(A[3]);var F=D+E*H;var I=A[0].length;var C=B.indexOf("$");\\nif(C\\x3c0){C=B.length;}return{oldLen:D,newLen:F,ops:B.substring(I,C),charBank:B.substring(C+1)};};Changeset.pack=function(C,G,F,D){var A=G-C;\\nvar E=(A>=0?">"+Changeset.numToString(A):"\\x3c"+Changeset.numToString(-A));var B=[];B.push("Z:",Changeset.numToString(C),E,F,"$",D);\\nreturn B.join("");};Changeset.applyToText=function(H,E){var C=Changeset.unpack(H);Changeset.assert(E.length==C.oldLen,"mismatched apply: ",E.length," / ",C.oldLen);\\nvar F=Changeset.opIterator(C.ops);var G=Changeset.stringIterator(C.charBank);var B=Changeset.stringIterator(E);\\nvar A=Changeset.stringAssembler();while(F.hasNext()){var D=F.next();switch(D.opcode){case"+":A.append(G.take(D.chars));\\nbreak;case"-":B.skip(D.chars);break;case"=":A.append(B.take(D.chars));break;}}A.append(B.take(B.remaining()));\\nreturn A.toString();};Changeset.mutateTextLines=function(G,F){var C=Changeset.unpack(G);var D=Changeset.opIterator(C.ops);\\nvar E=Changeset.stringIterator(C.charBank);var B=Changeset.textLinesMutator(F);while(D.hasNext()){var A=D.next();\\nswitch(A.opcode){case"+":B.insert(E.take(A.chars),A.lines);break;case"-":B.remove(A.chars,A.lines);break;\\ncase"=":B.skip(A.chars,A.lines,(!!A.attribs));break;}}B.close();};Changeset.composeAttributes=function(G,F,E,D){if((!G)&&E){return F;\\n}if(!F){return G;}var A=[];G.replace(/\\\\*([0-9a-z]+)/g,function(I,H){A.push(D.getAttrib(Changeset.parseNum(H)));\\nreturn"";});F.replace(/\\\\*([0-9a-z]+)/g,function(M,L){var H=D.getAttrib(Changeset.parseNum(L));var K=false;\\nfor(var I=0;I\\x3cA.length;I++){var J=A[I];if(J[0]==H[0]){if(H[1]||E){J[1]=H[1];}else{A.splice(I,1);}K=true;\\nbreak;}}if((!K)&&(H[1]||E)){A.push(H);}return"";});A.sort();var B=Changeset.stringAssembler();for(var C=0;\\nC\\x3cA.length;C++){B.append("*");B.append(Changeset.numToString(D.putAttrib(A[C])));}return B.toString();\\n};Changeset._slicerZipperFunc=function(A,B,C,D){if(A.opcode=="-"){Changeset.copyOp(A,C);A.opcode="";}else{if(!A.opcode){Changeset.copyOp(B,C);\\nB.opcode="";}else{switch(B.opcode){case"-":if(B.chars\\x3c=A.chars){if(A.opcode=="="){C.opcode="-";C.chars=B.chars;\\nC.lines=B.lines;C.attribs="";}A.chars-=B.chars;A.lines-=B.lines;B.opcode="";if(!A.chars){A.opcode="";\\n}}else{if(A.opcode=="="){C.opcode="-";C.chars=A.chars;C.lines=A.lines;C.attribs="";}B.chars-=A.chars;\\nB.lines-=A.lines;A.opcode="";}break;case"+":Changeset.copyOp(B,C);B.opcode="";break;case"=":if(B.chars\\x3c=A.chars){C.opcode=A.opcode;\\nC.chars=B.chars;C.lines=B.lines;C.attribs=Changeset.composeAttributes(A.attribs,B.attribs,A.opcode=="=",D);\\nB.opcode="";A.chars-=B.chars;A.lines-=B.lines;if(!A.chars){A.opcode="";}}else{C.opcode=A.opcode;C.chars=A.chars;\\nC.lines=A.lines;C.attribs=Changeset.composeAttributes(A.attribs,B.attribs,A.opcode=="=",D);A.opcode="";\\nB.chars-=A.chars;B.lines-=A.lines;}break;case"":Changeset.copyOp(A,C);A.opcode="";break;}}}};Changeset.applyToAttribution=function(D,C,B){var A=Changeset.unpack(D);\\nreturn Changeset.applyZip(C,0,A.ops,0,function(F,E,G){return Changeset._slicerZipperFunc(F,E,G,B);});\\n};Changeset.mutateAttributionLines=function(N,Q,O){var I=Changeset.unpack(N);var H=Changeset.opIterator(I.ops);\\nvar M=I.charBank;var G=0;var F=Changeset.textLinesMutator(Q);var B=null;function L(){return(B&&B.hasNext())||F.hasMore();\\n}function P(R){if((!(B&&B.hasNext()))&&F.hasMore()){var S=F.removeLines(1);B=Changeset.opIterator(S);\\n}if(B&&B.hasNext()){B.next(R);}else{R.opcode="";}}var D=null;function J(R){if(!D){D=Changeset.mergingOpAssembler();\\n}D.append(R);if(R.lines>0){Changeset.assert(R.lines==1,"Can\\\'t have op.lines of ",R.lines," in attribution lines");\\nF.insert(D.toString(),1);D=null;}}var A=Changeset.newOp();var E=Changeset.newOp();var C=Changeset.newOp();\\nwhile(A.opcode||H.hasNext()||E.opcode||L()){if((!A.opcode)&&H.hasNext()){H.next(A);}if((!A.opcode)&&(!E.opcode)&&(!D)&&(!(B&&B.hasNext()))){break;\\n}else{if(A.opcode=="="&&A.lines>0&&(!A.attribs)&&(!E.opcode)&&(!D)&&(!(B&&B.hasNext()))){F.skipLines(A.lines);\\nA.opcode="";}else{if(A.opcode=="+"){if(A.lines>1){var K=M.indexOf("\\\\n",G)+1-G;Changeset.copyOp(A,C);A.chars-=K;\\nA.lines--;C.lines=1;C.chars=K;}else{Changeset.copyOp(A,C);A.opcode="";}J(C);G+=C.chars;C.opcode="";}else{if((!E.opcode)&&L()){P(E);\\n}Changeset._slicerZipperFunc(E,A,C,O);if(C.opcode){J(C);C.opcode="";}}}}}Changeset.assert(!D,"line assembler not finished");\\nF.close();};Changeset.joinAttributionLines=function(D){var C=Changeset.mergingOpAssembler();for(var A=0;\\nA\\x3cD.length;A++){var E=D[A];var B=Changeset.opIterator(E);while(B.hasNext()){C.append(B.next());}}return C.toString();\\n};Changeset.splitAttributionLines=function(J,K){var G=Changeset.opIterator(J);var C=Changeset.mergingOpAssembler();\\nvar I=[];var D=0;function E(L){C.append(L);if(L.lines>0){I.push(C.toString());C.clear();}D+=L.chars;}while(G.hasNext()){var A=G.next();\\nvar F=A.chars;var B=A.lines;while(B>1){var H=K.indexOf("\\\\n",D)+1;Changeset.assert(H>0,"newlineEnd \\x3c= 0 in splitAttributionLines");\\nA.chars=H-D;A.lines=1;E(A);F-=A.chars;B-=A.lines;}if(B==1){A.chars=F;A.lines=1;}E(A);}return I;};Changeset.splitTextLines=function(A){return A.match(/[^\\\\n]*(?:\\\\n|[^\\\\n]$)/g);\\n};Changeset.compose=function(J,H,L){var B=Changeset.unpack(J);var A=Changeset.unpack(H);var K=B.oldLen;\\nvar I=B.newLen;Changeset.assert(I==A.oldLen,"mismatched composition");var G=A.newLen;var D=Changeset.stringIterator(B.charBank);\\nvar E=Changeset.stringIterator(A.charBank);var C=Changeset.stringAssembler();var F=Changeset.applyZip(B.ops,0,A.ops,0,function(O,N,M){var Q=O.opcode;\\nvar P=N.opcode;if(Q=="+"&&P=="-"){D.skip(Math.min(O.chars,N.chars));}Changeset._slicerZipperFunc(O,N,M,L);\\nif(M.opcode=="+"){if(P=="+"){C.append(E.take(M.chars));}else{C.append(D.take(M.chars));}}});return Changeset.pack(K,G,F,C.toString());\\n};Changeset.attributeTester=function(D,B){if(!B){return C;}var A=B.putAttrib(D,true);if(A\\x3c0){return C;\\n}else{var E=new RegExp("\\\\\\\\*"+Changeset.numToString(A)+"(?!\\\\\\\\w)");return function(F){return E.test(F);\\n};}function C(F){return false;}};Changeset.identity=function(A){return Changeset.pack(A,A,"","");};Changeset.makeSplice=function(B,A,F,E,H,J){var D=B.length;\\nif(A>=D){A=D-1;}if(F>B.length-A-1){F=B.length-A-1;}var G=B.substring(A,A+F);var I=D+E.length-G.length;\\nvar C=Changeset.smartOpAssembler();C.appendOpWithText("=",B.substring(0,A));C.appendOpWithText("-",G);\\nC.appendOpWithText("+",E,H,J);C.endDocument();return Changeset.pack(D,I,C.toString(),E);};Changeset.toSplices=function(G){var F=Changeset.unpack(G);\\nvar B=[];var C=0;var E=Changeset.opIterator(F.ops);var H=Changeset.stringIterator(F.charBank);var D=false;\\nwhile(E.hasNext()){var A=E.next();if(A.opcode=="="){C+=A.chars;D=false;}else{if(!D){B.push([C,C,""]);\\nD=true;}if(A.opcode=="-"){C+=A.chars;B[B.length-1][1]+=A.chars;}else{if(A.opcode=="+"){B[B.length-1][2]+=H.take(A.chars);\\n}}}}return B;};Changeset.characterRangeFollow=function(M,N,L,K){var C=N;var A=L;var J=Changeset.toSplices(M);\\nvar H=0;for(var G=0;G\\x3cJ.length;G++){var F=J[G];var B=F[0]+H;var E=F[1]+H;var I=F[2].length;var D=I-(E-B);\\nif(B\\x3c=C&&E>=A){if(K){C=A=B;}else{C=A=B+I;}}else{if(E\\x3c=C){C+=D;A+=D;}else{if(B>=A){}else{if(B>=C&&E\\x3c=A){A+=D;\\n}else{if(E\\x3cA){C=B+I;A+=D;}else{A=B;}}}}}H+=D;}return[C,A];};Changeset.moveOpsToNewPool=function(A,F,C){var B=A.indexOf("$");\\nif(B\\x3c0){B=A.length;}var D=A.substring(0,B);var E=A.substring(B);return D.replace(/\\\\*([0-9a-z]+)/g,function(K,G){var H=Changeset.parseNum(G);\\nvar J=F.getAttrib(H);var I=C.putAttrib(J);return"*"+Changeset.numToString(I);})+E;};Changeset.makeAttribution=function(B){var A=Changeset.smartOpAssembler();\\nA.appendOpWithText("+",B);return A.toString();};Changeset.eachAttribNumber=function(A,D){var B=A.indexOf("$");\\nif(B\\x3c0){B=A.length;}var C=A.substring(0,B);C.replace(/\\\\*([0-9a-z]+)/g,function(F,E){D(Changeset.parseNum(E));\\nreturn"";});};Changeset.filterAttribNumbers=function(B,A){return Changeset.mapAttribNumbers(B,A);};Changeset.mapAttribNumbers=function(A,E){var B=A.indexOf("$");\\nif(B\\x3c0){B=A.length;}var D=A.substring(0,B);var C=D.replace(/\\\\*([0-9a-z]+)/g,function(H,G){var F=E(Changeset.parseNum(G));\\nif(F===true){return H;}else{if((typeof F)==="number"){return"*"+Changeset.numToString(F);}else{return"";\\n}}});return C+A.substring(B);};Changeset.makeAText=function(A,B){return{text:A,attribs:(B||Changeset.makeAttribution(A))};\\n};Changeset.applyToAText=function(A,B,C){return{text:Changeset.applyToText(A,B.text),attribs:Changeset.applyToAttribution(A,B.attribs,C)};\\n};Changeset.cloneAText=function(A){return{text:A.text,attribs:A.attribs};};Changeset.copyAText=function(A,B){B.text=A.text;\\nB.attribs=A.attribs;};Changeset.appendATextToAssembler=function(C,B){var D=Changeset.opIterator(C.attribs);\\nvar A=Changeset.newOp();while(D.hasNext()){D.next(A);if(!D.hasNext()){if(A.lines\\x3c=1){A.lines=0;A.chars--;\\nif(A.chars){B.append(A);}}else{var F=C.text.lastIndexOf("\\\\n",C.text.length-2)+1;var E=C.text.length-F-1;\\nA.lines--;A.chars-=(E+1);B.append(A);A.lines=0;A.chars=E;if(A.chars){B.append(A);}}}else{B.append(A);\\n}}};Changeset.prepareForWire=function(C,B){var A=new AttribPool();var D=Changeset.moveOpsToNewPool(C,B,A);\\nreturn{translated:D,pool:A};};Changeset.isIdentity=function(B){var A=Changeset.unpack(B);return A.ops==""&&A.oldLen==A.newLen;\\n};Changeset.opAttributeValue=function(C,B,A){return Changeset.attribsAttributeValue(C.attribs,B,A);};\\nChangeset.attribsAttributeValue=function(C,D,A){var B="";if(C){Changeset.eachAttribNumber(C,function(E){if(A.getAttribKey(E)==D){B=A.getAttribValue(E);\\n}});}return B;};Changeset.builder=function(D){var B=Changeset.smartOpAssembler();var A=Changeset.newOp();\\nvar E=Changeset.stringAssembler();var C={keep:function(I,G,F,H){A.opcode="=";A.attribs=(F&&Changeset.makeAttribsString("=",F,H))||"";\\nA.chars=I;A.lines=(G||0);B.append(A);return C;},keepText:function(H,G,F){B.appendOpWithText("=",H,G,F);\\nreturn C;},insert:function(F,H,G){B.appendOpWithText("+",F,H,G);E.append(F);return C;},remove:function(G,F){A.opcode="-";\\nA.attribs="";A.chars=G;A.lines=(F||0);B.append(A);return C;},toString:function(){B.endDocument();var F=D+B.getLengthChange();\\nreturn Changeset.pack(D,F,B.toString(),E.toString());}};return 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diff --git a/etherpad/src/static/js/colorutils.js b/etherpad/src/static/js/colorutils.js
deleted file mode 100644
index e745f8e..0000000
--- a/etherpad/src/static/js/colorutils.js
+++ /dev/null
@@ -1,91 +0,0 @@
-// DO NOT EDIT THIS FILE, edit infrastructure/ace/www/colorutils.js
-
-/**
- * Copyright 2009 Google Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS-IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-var colorutils = {};
-
-// "#ffffff" or "#fff" or "ffffff" or "fff" to [1.0, 1.0, 1.0]
-colorutils.css2triple = function(cssColor) {
-  var sixHex = colorutils.css2sixhex(cssColor);
-  function hexToFloat(hh) {
-    return Number("0x"+hh)/255;
-  }
-  return [hexToFloat(sixHex.substr(0,2)),
-	  hexToFloat(sixHex.substr(2,2)),
-	  hexToFloat(sixHex.substr(4,2))];
-}
-
-// "#ffffff" or "#fff" or "ffffff" or "fff" to "ffffff"
-colorutils.css2sixhex = function(cssColor) {
-  var h = /[0-9a-fA-F]+/.exec(cssColor)[0];
-  if (h.length != 6) {
-    var a = h.charAt(0);
-    var b = h.charAt(1);
-    var c = h.charAt(2);
-    h = a+a+b+b+c+c;
-  }
-  return h;
-}
-
-// [1.0, 1.0, 1.0] -> "#ffffff"
-colorutils.triple2css = function(triple) {
-  function floatToHex(n) {
-    var n2 = colorutils.clamp(Math.round(n*255), 0, 255);
-    return ("0"+n2.toString(16)).slice(-2);
-  }
-  return "#" + floatToHex(triple[0]) +
-    floatToHex(triple[1]) + floatToHex(triple[2]);
-}
-
-
-colorutils.clamp = function(v,bot,top) { return v < bot ? bot : (v > top ? top : v); };
-colorutils.min3 = function(a,b,c) { return (a < b) ? (a < c ? a : c) : (b < c ? b : c); };
-colorutils.max3 = function(a,b,c) { return (a > b) ? (a > c ? a : c) : (b > c ? b : c); };
-colorutils.colorMin = function(c) { return colorutils.min3(c[0], c[1], c[2]); };
-colorutils.colorMax = function(c) { return colorutils.max3(c[0], c[1], c[2]); };
-colorutils.scale = function(v, bot, top) { return colorutils.clamp(bot + v*(top-bot), 0, 1); };
-colorutils.unscale = function(v, bot, top) { return colorutils.clamp((v-bot)/(top-bot), 0, 1); };
-
-colorutils.scaleColor = function(c, bot, top) {
-  return [colorutils.scale(c[0], bot, top),
-	  colorutils.scale(c[1], bot, top),
-	  colorutils.scale(c[2], bot, top)];
-}
-
-colorutils.unscaleColor = function(c, bot, top) {
-  return [colorutils.unscale(c[0], bot, top),
-	  colorutils.unscale(c[1], bot, top),
-	  colorutils.unscale(c[2], bot, top)];
-}
-
-colorutils.luminosity = function(c) {
-  // rule of thumb for RGB brightness; 1.0 is white
-  return c[0]*0.30 + c[1]*0.59 + c[2]*0.11;
-}
-
-colorutils.saturate = function(c) {
-  var min = colorutils.colorMin(c);
-  var max = colorutils.colorMax(c);
-  if (max - min <= 0) return [1.0, 1.0, 1.0];
-  return colorutils.unscaleColor(c, min, max);
-}
-
-colorutils.blend = function(c1, c2, t) {
-  return [colorutils.scale(t, c1[0], c2[0]),
-	  colorutils.scale(t, c1[1], c2[1]),
-	  colorutils.scale(t, c1[2], c2[2])];
-}
diff --git a/etherpad/src/static/js/cssmanager_client.js b/etherpad/src/static/js/cssmanager_client.js
deleted file mode 100644
index 04ed641..0000000
--- a/etherpad/src/static/js/cssmanager_client.js
+++ /dev/null
@@ -1,88 +0,0 @@
-// DO NOT EDIT THIS FILE, edit infrastructure/ace/www/cssmanager.js
-
-/**
- * Copyright 2009 Google Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS-IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-function makeCSSManager(emptyStylesheetTitle) {
-
-  function getSheetByTitle(title) {
-    var allSheets = document.styleSheets;
-    for(var i=0;i<allSheets.length;i++) {
-      var s = allSheets[i];
-      if (s.title == title) {
-	return s;
-      }
-    }
-    return null;
-  }
-
-  /*function getSheetTagByTitle(title) {
-    var allStyleTags = document.getElementsByTagName("style");
-    for(var i=0;i<allStyleTags.length;i++) {
-      var t = allStyleTags[i];
-      if (t.title == title) {
-	return t;
-      }
-    }
-    return null;
-  }*/
-
-  var browserSheet = getSheetByTitle(emptyStylesheetTitle);
-  //var browserTag = getSheetTagByTitle(emptyStylesheetTitle);
-  function browserRules() { return (browserSheet.cssRules || browserSheet.rules); }
-  function browserDeleteRule(i) {
-    if (browserSheet.deleteRule) browserSheet.deleteRule(i);
-    else browserSheet.removeRule(i);
-  }
-  function browserInsertRule(i, selector) {
-    if (browserSheet.insertRule) browserSheet.insertRule(selector+' {}', i);
-    else browserSheet.addRule(selector, null, i);
-  }
-  var selectorList = [];
-
-  function indexOfSelector(selector) {
-    for(var i=0;i<selectorList.length;i++) {
-      if (selectorList[i] == selector) {
-	return i;
-      }
-    }
-    return -1;
-  }
-
-  function selectorStyle(selector) {
-    var i = indexOfSelector(selector);
-    if (i < 0) {
-      // add selector
-      browserInsertRule(0, selector);
-      selectorList.splice(0, 0, selector);
-      i = 0;
-    }
-    return browserRules().item(i).style;
-  }
-
-  function removeSelectorStyle(selector) {
-    var i = indexOfSelector(selector);
-    if (i >= 0) {
-      browserDeleteRule(i);
-      selectorList.splice(i, 1);
-    }
-  }
-
-  return {selectorStyle:selectorStyle, removeSelectorStyle:removeSelectorStyle,
-	  info: function() {
-	    return selectorList.length+":"+browserRules().length;
-	  }};
-}
diff --git a/etherpad/src/static/js/domline_client.js b/etherpad/src/static/js/domline_client.js
deleted file mode 100644
index de2e7d3..0000000
--- a/etherpad/src/static/js/domline_client.js
+++ /dev/null
@@ -1,210 +0,0 @@
-// DO NOT EDIT THIS FILE, edit infrastructure/ace/www/domline.js
-
-/**
- * Copyright 2009 Google Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS-IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-var domline = {};
-domline.noop = function() {};
-domline.identity = function(x) { return x; };
-
-domline.addToLineClass = function(lineClass, cls) {
-  // an "empty span" at any point can be used to add classes to
-  // the line, using line:className.  otherwise, we ignore
-  // the span.
-  cls.replace(/\S+/g, function (c) {
-    if (c.indexOf("line:") == 0) {
-      // add class to line
-      lineClass = (lineClass ? lineClass+' ' : '')+c.substring(5);
-    }
-  });
-  return lineClass;
-}
-
-// if "document" is falsy we don't create a DOM node, just
-// an object with innerHTML and className
-domline.createDomLine = function(nonEmpty, doesWrap, optBrowser, optDocument) {
-  var result = { node: null,
-                 appendSpan: domline.noop,
-                 prepareForAdd: domline.noop,
-                 notifyAdded: domline.noop,
-                 clearSpans: domline.noop,
-                 finishUpdate: domline.noop,
-                 lineMarker: 0 };
-
-  var browser = (optBrowser || {});
-  var document = optDocument;
-
-  if (document) {
-    result.node = document.createElement("div");
-  }
-  else {
-    result.node = {innerHTML: '', className: ''};
-  }
-
-  var html = [];
-  var preHtml, postHtml;
-  var curHTML = null;
-  function processSpaces(s) {
-    return domline.processSpaces(s, doesWrap);
-  }
-  var identity = domline.identity;
-  var perTextNodeProcess = (doesWrap ? identity : processSpaces);
-  var perHtmlLineProcess = (doesWrap ? processSpaces : identity);
-  var lineClass = 'ace-line';
-  result.appendSpan = function(txt, cls) {
-    if (cls.indexOf('list') >= 0) {
-      var listType = /(?:^| )list:(\S+)/.exec(cls);
-      if (listType) {
-        listType = listType[1];
-        if (listType) {
-          preHtml = '<ul class="list-'+listType+'"><li>';
-          postHtml = '</li></ul>';
-        }
-        result.lineMarker += txt.length;
-        return; // don't append any text
-      }
-    }
-    var href = null;
-    var simpleTags = null;
-    if (cls.indexOf('url') >= 0) {
-      cls = cls.replace(/(^| )url:(\S+)/g, function(x0, space, url) {
-	href = url;
-	return space+"url";
-      });
-    }
-    if (cls.indexOf('tag') >= 0) {
-      cls = cls.replace(/(^| )tag:(\S+)/g, function(x0, space, tag) {
-	if (! simpleTags) simpleTags = [];
-	simpleTags.push(tag.toLowerCase());
-	return space+tag;
-      });
-    }
-    if ((! txt) && cls) {
-      lineClass = domline.addToLineClass(lineClass, cls);
-    }
-    else if (txt) {
-      var extraOpenTags = "";
-      var extraCloseTags = "";
-      if (href) {
-	extraOpenTags = extraOpenTags+'<a href="'+
-	  href.replace(/\"/g, '&quot;')+'">';
-	extraCloseTags = '</a>'+extraCloseTags;
-      }
-      if (simpleTags) {
-	simpleTags.sort();
-	extraOpenTags = extraOpenTags+'<'+simpleTags.join('><')+'>';
-	simpleTags.reverse();
-	extraCloseTags = '</'+simpleTags.join('></')+'>'+extraCloseTags;
-      }
-      html.push('<span class="',cls||'','">',extraOpenTags,
-		perTextNodeProcess(domline.escapeHTML(txt)),
-                extraCloseTags,'</span>');
-    }
-  };
-  result.clearSpans = function() {
-    html = [];
-    lineClass = ''; // non-null to cause update
-    result.lineMarker = 0;
-  };
-  function writeHTML() {
-    var newHTML = perHtmlLineProcess(html.join(''));
-    if (! newHTML) {
-      if ((! document) || (! optBrowser)) {
-        newHTML += '&nbsp;';
-      }
-      else if (! browser.msie) {
-        newHTML += '<br/>';
-      }
-    }
-    if (nonEmpty) {
-      newHTML = (preHtml||'')+newHTML+(postHtml||'');
-    }
-    html = preHtml = postHtml = null; // free memory
-    if (newHTML !== curHTML) {
-      curHTML = newHTML;
-      result.node.innerHTML = curHTML;
-    }
-    if (lineClass !== null) result.node.className = lineClass;
-  }
-  result.prepareForAdd = writeHTML;
-  result.finishUpdate = writeHTML;
-  result.getInnerHTML = function() { return curHTML || ''; };
-
-  return result;
-};
-
-domline.escapeHTML = function(s) {
-  var re = /[&<>'"]/g; /']/; // stupid indentation thing
-  if (! re.MAP) {
-    // persisted across function calls!
-    re.MAP = {
-      '&': '&amp;',
-      '<': '&lt;',
-      '>': '&gt;',
-      '"': '&#34;',
-      "'": '&#39;'
-    };
-  }
-  return s.replace(re, function(c) { return re.MAP[c]; });
-};
-
-domline.processSpaces = function(s, doesWrap) {
-  if (s.indexOf("<") < 0 && ! doesWrap) {
-    // short-cut
-    return s.replace(/ /g, '&nbsp;');
-  }
-  var parts = [];
-  s.replace(/<[^>]*>?| |[^ <]+/g, function(m) { parts.push(m); });
-  if (doesWrap) {
-    var endOfLine = true;
-    var beforeSpace = false;
-    // last space in a run is normal, others are nbsp,
-    // end of line is nbsp
-    for(var i=parts.length-1;i>=0;i--) {
-      var p = parts[i];
-      if (p == " ") {
-	if (endOfLine || beforeSpace)
-	  parts[i] = '&nbsp;';
-	endOfLine = false;
-	beforeSpace = true;
-      }
-      else if (p.charAt(0) != "<") {
-	endOfLine = false;
-	beforeSpace = false;
-      }
-    }
-    // beginning of line is nbsp
-    for(var i=0;i<parts.length;i++) {
-      var p = parts[i];
-      if (p == " ") {
-	parts[i] = '&nbsp;';
-	break;
-      }
-      else if (p.charAt(0) != "<") {
-	break;
-      }
-    }
-  }
-  else {
-    for(var i=0;i<parts.length;i++) {
-      var p = parts[i];
-      if (p == " ") {
-	parts[i] = '&nbsp;';
-      }
-    }
-  }
-  return parts.join('');
-};
diff --git a/etherpad/src/static/js/easysync2_client.js b/etherpad/src/static/js/easysync2_client.js
deleted file mode 100644
index 043099c..0000000
--- a/etherpad/src/static/js/easysync2_client.js
+++ /dev/null
@@ -1,1777 +0,0 @@
-// DO NOT EDIT THIS FILE, edit infrastructure/ace/www/easysync2.js
-
-/**
- * Copyright 2009 Google Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS-IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-//var _opt = (this.Easysync2Support || null);
-var _opt = null; // disable optimization for now
-
-function AttribPool() {
-  var p = {};
-  p.numToAttrib = {}; // e.g. {0: ['foo','bar']}
-  p.attribToNum = {}; // e.g. {'foo,bar': 0}
-  p.nextNum = 0;
-
-  p.putAttrib = function(attrib, dontAddIfAbsent) {
-    var str = String(attrib);
-    if (str in p.attribToNum) {
-      return p.attribToNum[str];
-    }
-    if (dontAddIfAbsent) {
-      return -1;
-    }
-    var num = p.nextNum++;
-    p.attribToNum[str] = num;
-    p.numToAttrib[num] = [String(attrib[0]||''),
-			  String(attrib[1]||'')];
-    return num;
-  };
-
-  p.getAttrib = function(num) {
-    var pair = p.numToAttrib[num];
-    if (! pair) return pair;
-    return [pair[0], pair[1]]; // return a mutable copy
-  };
-
-  p.getAttribKey = function(num) {
-    var pair = p.numToAttrib[num];
-    if (! pair) return '';
-    return pair[0];
-  };
-
-  p.getAttribValue = function(num) {
-    var pair = p.numToAttrib[num];
-    if (! pair) return '';
-    return pair[1];
-  };
-
-  p.eachAttrib = function(func) {
-    for(var n in p.numToAttrib) {
-      var pair = p.numToAttrib[n];
-      func(pair[0], pair[1]);
-    }
-  };
-
-  p.toJsonable = function() {
-    return {numToAttrib: p.numToAttrib, nextNum: p.nextNum};
-  };
-
-  p.fromJsonable = function(obj) {
-    p.numToAttrib = obj.numToAttrib;
-    p.nextNum = obj.nextNum;
-    p.attribToNum = {};
-    for(var n in p.numToAttrib) {
-      p.attribToNum[String(p.numToAttrib[n])] = Number(n);
-    }
-    return p;
-  };
-
-  return p;
-}
-
-var Changeset = {};
-
-Changeset.error = function error(msg) { var e = new Error(msg); e.easysync = true; throw e; };
-Changeset.assert = function assert(b, msgParts) {
-  if (! b) {
-    var msg = Array.prototype.slice.call(arguments, 1).join('');
-    Changeset.error("Changeset: "+msg);
-  }
-};
-
-Changeset.parseNum = function(str) { return parseInt(str, 36); };
-Changeset.numToString = function(num) { return num.toString(36).toLowerCase(); };
-Changeset.toBaseTen = function(cs) {
-  var dollarIndex = cs.indexOf('$');
-  var beforeDollar = cs.substring(0, dollarIndex);
-  var fromDollar = cs.substring(dollarIndex);
-  return beforeDollar.replace(/[0-9a-z]+/g, function(s) {
-    return String(Changeset.parseNum(s)); }) + fromDollar;
-};
-
-Changeset.oldLen = function(cs) {
-  return Changeset.unpack(cs).oldLen;
-};
-Changeset.newLen = function(cs) {
-  return Changeset.unpack(cs).newLen;
-};
-
-Changeset.opIterator = function(opsStr, optStartIndex) {
-  //print(opsStr);
-  var regex = /((?:\*[0-9a-z]+)*)(?:\|([0-9a-z]+))?([-+=])([0-9a-z]+)|\?|/g;
-  var startIndex = (optStartIndex || 0);
-  var curIndex = startIndex;
-  var prevIndex = curIndex;
-  function nextRegexMatch() {
-    prevIndex = curIndex;
-    var result;
-    if (_opt) {
-      result = _opt.nextOpInString(opsStr, curIndex);
-      if (result) {
-        if (result.opcode() == '?') {
-          Changeset.error("Hit error opcode in op stream");
-        }
-        curIndex = result.lastIndex();
-      }
-    }
-    else {
-      regex.lastIndex = curIndex;
-      result = regex.exec(opsStr);
-      curIndex = regex.lastIndex;
-      if (result[0] == '?') {
-        Changeset.error("Hit error opcode in op stream");
-      }
-    }
-    return result;
-  }
-  var regexResult = nextRegexMatch();
-  var obj = Changeset.newOp();
-  function next(optObj) {
-    var op = (optObj || obj);
-    if (_opt && regexResult) {
-      op.attribs = regexResult.attribs();
-      op.lines = regexResult.lines();
-      op.chars = regexResult.chars();
-      op.opcode = regexResult.opcode();
-      regexResult = nextRegexMatch();
-    }
-    else if ((! _opt) && regexResult[0]) {
-      op.attribs = regexResult[1];
-      op.lines = Changeset.parseNum(regexResult[2] || 0);
-      op.opcode = regexResult[3];
-      op.chars = Changeset.parseNum(regexResult[4]);
-      regexResult = nextRegexMatch();
-    }
-    else {
-      Changeset.clearOp(op);
-    }
-    return op;
-  }
-  function hasNext() { return !! (_opt ? regexResult : regexResult[0]); }
-  function lastIndex() { return prevIndex; }
-  return {next: next, hasNext: hasNext, lastIndex: lastIndex};
-};
-
-Changeset.clearOp = function(op) {
-  op.opcode = '';
-  op.chars = 0;
-  op.lines = 0;
-  op.attribs = '';
-};
-Changeset.newOp = function(optOpcode) {
-  return {opcode:(optOpcode || ''), chars:0, lines:0, attribs:''};
-};
-Changeset.cloneOp = function(op) {
-  return {opcode: op.opcode, chars: op.chars, lines: op.lines, attribs: op.attribs};
-};
-Changeset.copyOp = function(op1, op2) {
-  op2.opcode = op1.opcode;
-  op2.chars = op1.chars;
-  op2.lines = op1.lines;
-  op2.attribs = op1.attribs;
-};
-Changeset.opString = function(op) {
-  // just for debugging
-  if (! op.opcode) return 'null';
-  var assem = Changeset.opAssembler();
-  assem.append(op);
-  return assem.toString();
-};
-Changeset.stringOp = function(str) {
-  // just for debugging
-  return Changeset.opIterator(str).next();
-};
-
-Changeset.checkRep = function(cs) {
-  // doesn't check things that require access to attrib pool (e.g. attribute order)
-  // or original string (e.g. newline positions)
-  var unpacked = Changeset.unpack(cs);
-  var oldLen = unpacked.oldLen;
-  var newLen = unpacked.newLen;
-  var ops = unpacked.ops;
-  var charBank = unpacked.charBank;
-
-  var assem = Changeset.smartOpAssembler();
-  var oldPos = 0;
-  var calcNewLen = 0;
-  var numInserted = 0;
-  var iter = Changeset.opIterator(ops);
-  while (iter.hasNext()) {
-    var o = iter.next();
-    switch (o.opcode) {
-    case '=': oldPos += o.chars; calcNewLen += o.chars; break;
-    case '-': oldPos += o.chars; Changeset.assert(oldPos < oldLen, oldPos," >= ",oldLen," in ",cs); break;
-    case '+': {
-      calcNewLen += o.chars; numInserted += o.chars;
-      Changeset.assert(calcNewLen < newLen, calcNewLen," >= ",newLen," in ",cs);
-      break;
-    }
-    }
-    assem.append(o);
-  }
-
-  calcNewLen += oldLen - oldPos;
-  charBank = charBank.substring(0, numInserted);
-  while (charBank.length < numInserted) {
-    charBank += "?";
-  }
-
-  assem.endDocument();
-  var normalized = Changeset.pack(oldLen, calcNewLen, assem.toString(), charBank);
-  Changeset.assert(normalized == cs, normalized,' != ',cs);
-
-  return cs;
-}
-
-Changeset.smartOpAssembler = function() {
-  // Like opAssembler but able to produce conforming changesets
-  // from slightly looser input, at the cost of speed.
-  // Specifically:
-  // - merges consecutive operations that can be merged
-  // - strips final "="
-  // - ignores 0-length changes
-  // - reorders consecutive + and - (which margingOpAssembler doesn't do)
-
-  var minusAssem = Changeset.mergingOpAssembler();
-  var plusAssem = Changeset.mergingOpAssembler();
-  var keepAssem = Changeset.mergingOpAssembler();
-  var assem = Changeset.stringAssembler();
-  var lastOpcode = '';
-  var lengthChange = 0;
-
-  function flushKeeps() {
-    assem.append(keepAssem.toString());
-    keepAssem.clear();
-  }
-
-  function flushPlusMinus() {
-    assem.append(minusAssem.toString());
-    minusAssem.clear();
-    assem.append(plusAssem.toString());
-    plusAssem.clear();
-  }
-
-  function append(op) {
-    if (! op.opcode) return;
-    if (! op.chars) return;
-
-    if (op.opcode == '-') {
-      if (lastOpcode == '=') {
-	flushKeeps();
-      }
-      minusAssem.append(op);
-      lengthChange -= op.chars;
-    }
-    else if (op.opcode == '+') {
-      if (lastOpcode == '=') {
-	flushKeeps();
-      }
-      plusAssem.append(op);
-      lengthChange += op.chars;
-    }
-    else if (op.opcode == '=') {
-      if (lastOpcode != '=') {
-	flushPlusMinus();
-      }
-      keepAssem.append(op);
-    }
-    lastOpcode = op.opcode;
-  }
-
-  function appendOpWithText(opcode, text, attribs, pool) {
-    var op = Changeset.newOp(opcode);
-    op.attribs = Changeset.makeAttribsString(opcode, attribs, pool);
-    var lastNewlinePos = text.lastIndexOf('\n');
-    if (lastNewlinePos < 0) {
-      op.chars = text.length;
-      op.lines = 0;
-      append(op);
-    }
-    else {
-      op.chars = lastNewlinePos+1;
-      op.lines = text.match(/\n/g).length;
-      append(op);
-      op.chars = text.length - (lastNewlinePos+1);
-      op.lines = 0;
-      append(op);
-    }
-  }
-
-  function toString() {
-    flushPlusMinus();
-    flushKeeps();
-    return assem.toString();
-  }
-
-  function clear() {
-    minusAssem.clear();
-    plusAssem.clear();
-    keepAssem.clear();
-    assem.clear();
-    lengthChange = 0;
-  }
-
-  function endDocument() {
-    keepAssem.endDocument();
-  }
-
-  function getLengthChange() {
-    return lengthChange;
-  }
-
-  return {append: append, toString: toString, clear: clear, endDocument: endDocument,
-	  appendOpWithText: appendOpWithText, getLengthChange: getLengthChange };
-};
-
-if (_opt) {
-  Changeset.mergingOpAssembler = function() {
-    var assem = _opt.mergingOpAssembler();
-
-    function append(op) {
-      assem.append(op.opcode, op.chars, op.lines, op.attribs);
-    }
-    function toString() {
-      return assem.toString();
-    }
-    function clear() {
-      assem.clear();
-    }
-    function endDocument() {
-      assem.endDocument();
-    }
-
-    return {append: append, toString: toString, clear: clear, endDocument: endDocument};
-  };
-}
-else {
-  Changeset.mergingOpAssembler = function() {
-    // This assembler can be used in production; it efficiently
-    // merges consecutive operations that are mergeable, ignores
-    // no-ops, and drops final pure "keeps".  It does not re-order
-    // operations.
-    var assem = Changeset.opAssembler();
-    var bufOp = Changeset.newOp();
-
-    // If we get, for example, insertions [xxx\n,yyy], those don't merge,
-    // but if we get [xxx\n,yyy,zzz\n], that merges to [xxx\nyyyzzz\n].
-    // This variable stores the length of yyy and any other newline-less
-    // ops immediately after it.
-    var bufOpAdditionalCharsAfterNewline = 0;
-
-    function flush(isEndDocument) {
-      if (bufOp.opcode) {
-        if (isEndDocument && bufOp.opcode == '=' && ! bufOp.attribs) {
-          // final merged keep, leave it implicit
-        }
-        else {
-          assem.append(bufOp);
-          if (bufOpAdditionalCharsAfterNewline) {
-            bufOp.chars = bufOpAdditionalCharsAfterNewline;
-            bufOp.lines = 0;
-            assem.append(bufOp);
-            bufOpAdditionalCharsAfterNewline = 0;
-          }
-        }
-        bufOp.opcode = '';
-      }
-    }
-    function append(op) {
-      if (op.chars > 0) {
-        if (bufOp.opcode == op.opcode && bufOp.attribs == op.attribs) {
-          if (op.lines > 0) {
-            // bufOp and additional chars are all mergeable into a multi-line op
-            bufOp.chars += bufOpAdditionalCharsAfterNewline + op.chars;
-            bufOp.lines += op.lines;
-            bufOpAdditionalCharsAfterNewline = 0;
-          }
-          else if (bufOp.lines == 0) {
-            // both bufOp and op are in-line
-            bufOp.chars += op.chars;
-          }
-          else {
-            // append in-line text to multi-line bufOp
-            bufOpAdditionalCharsAfterNewline += op.chars;
-          }
-        }
-        else {
-          flush();
-          Changeset.copyOp(op, bufOp);
-        }
-      }
-    }
-    function endDocument() {
-      flush(true);
-    }
-    function toString() {
-      flush();
-      return assem.toString();
-    }
-    function clear() {
-      assem.clear();
-      Changeset.clearOp(bufOp);
-    }
-    return {append: append, toString: toString, clear: clear, endDocument: endDocument};
-  };
-}
-
-if (_opt) {
-  Changeset.opAssembler = function() {
-    var assem = _opt.opAssembler();
-    // this function allows op to be mutated later (doesn't keep a ref)
-    function append(op) {
-      assem.append(op.opcode, op.chars, op.lines, op.attribs);
-    }
-    function toString() {
-      return assem.toString();
-    }
-    function clear() {
-      assem.clear();
-    }
-    return {append: append, toString: toString, clear: clear};
-  };
-}
-else {
-  Changeset.opAssembler = function() {
-    var pieces = [];
-    // this function allows op to be mutated later (doesn't keep a ref)
-    function append(op) {
-      pieces.push(op.attribs);
-      if (op.lines) {
-        pieces.push('|', Changeset.numToString(op.lines));
-      }
-      pieces.push(op.opcode);
-      pieces.push(Changeset.numToString(op.chars));
-    }
-    function toString() {
-      return pieces.join('');
-    }
-    function clear() {
-      pieces.length = 0;
-    }
-    return {append: append, toString: toString, clear: clear};
-  };
-}
-
-Changeset.stringIterator = function(str) {
-  var curIndex = 0;
-  function assertRemaining(n) {
-    Changeset.assert(n <= remaining(), "!(",n," <= ",remaining(),")");
-  }
-  function take(n) {
-    assertRemaining(n);
-    var s = str.substr(curIndex, n);
-    curIndex += n;
-    return s;
-  }
-  function peek(n) {
-    assertRemaining(n);
-    var s = str.substr(curIndex, n);
-    return s;
-  }
-  function skip(n) {
-    assertRemaining(n);
-    curIndex += n;
-  }
-  function remaining() {
-    return str.length - curIndex;
-  }
-  return {take:take, skip:skip, remaining:remaining, peek:peek};
-};
-
-Changeset.stringAssembler = function() {
-  var pieces = [];
-  function append(x) {
-    pieces.push(String(x));
-  }
-  function toString() {
-    return pieces.join('');
-  }
-  return {append: append, toString: toString};
-};
-
-// "lines" need not be an array as long as it supports certain calls (lines_foo inside).
-Changeset.textLinesMutator = function(lines) {
-  // Mutates lines, an array of strings, in place.
-  // Mutation operations have the same constraints as changeset operations
-  // with respect to newlines, but not the other additional constraints
-  // (i.e. ins/del ordering, forbidden no-ops, non-mergeability, final newline).
-  // Can be used to mutate lists of strings where the last char of each string
-  // is not actually a newline, but for the purposes of N and L values,
-  // the caller should pretend it is, and for things to work right in that case, the input
-  // to insert() should be a single line with no newlines.
-
-  var curSplice = [0,0];
-  var inSplice = false;
-  // position in document after curSplice is applied:
-  var curLine = 0, curCol = 0;
-  // invariant: if (inSplice) then (curLine is in curSplice[0] + curSplice.length - {2,3}) &&
-  //            curLine >= curSplice[0]
-  // invariant: if (inSplice && (curLine >= curSplice[0] + curSplice.length - 2)) then
-  //            curCol == 0
-
-  function lines_applySplice(s) {
-    lines.splice.apply(lines, s);
-  }
-  function lines_toSource() {
-    return lines.toSource();
-  }
-  function lines_get(idx) {
-    if (lines.get) {
-      return lines.get(idx);
-    }
-    else {
-      return lines[idx];
-    }
-  }
-  // can be unimplemented if removeLines's return value not needed
-  function lines_slice(start, end) {
-    if (lines.slice) {
-      return lines.slice(start, end);
-    }
-    else {
-      return [];
-    }
-  }
-  function lines_length() {
-    if ((typeof lines.length) == "number") {
-      return lines.length;
-    }
-    else {
-      return lines.length();
-    }
-  }
-
-  function enterSplice() {
-    curSplice[0] = curLine;
-    curSplice[1] = 0;
-    if (curCol > 0) {
-      putCurLineInSplice();
-    }
-    inSplice = true;
-  }
-  function leaveSplice() {
-    lines_applySplice(curSplice);
-    curSplice.length = 2;
-    curSplice[0] = curSplice[1] = 0;
-    inSplice = false;
-  }
-  function isCurLineInSplice() {
-    return (curLine - curSplice[0] < (curSplice.length - 2));
-  }
-  function debugPrint(typ) {
-    print(typ+": "+curSplice.toSource()+" / "+curLine+","+curCol+" / "+lines_toSource());
-  }
-  function putCurLineInSplice() {
-    if (! isCurLineInSplice()) {
-      curSplice.push(lines_get(curSplice[0] + curSplice[1]));
-      curSplice[1]++;
-    }
-    return 2 + curLine - curSplice[0];
-  }
-
-  function skipLines(L, includeInSplice) {
-    if (L) {
-      if (includeInSplice) {
-	if (! inSplice) {
-	  enterSplice();
-	}
-	for(var i=0;i<L;i++) {
-	  curCol = 0;
-	  putCurLineInSplice();
-	  curLine++;
-	}
-      }
-      else {
-	if (inSplice) {
-	  if (L > 1) {
-	    leaveSplice();
-	  }
-	  else {
-	    putCurLineInSplice();
-	  }
-	}
-	curLine += L;
-	curCol = 0;
-      }
-      //print(inSplice+" / "+isCurLineInSplice()+" / "+curSplice[0]+" / "+curSplice[1]+" / "+lines.length);
-      /*if (inSplice && (! isCurLineInSplice()) && (curSplice[0] + curSplice[1] < lines.length)) {
-	  print("BLAH");
-	  putCurLineInSplice();
-	}*/ // tests case foo in remove(), which isn't otherwise covered in current impl
-    }
-    //debugPrint("skip");
-  }
-
-  function skip(N, L, includeInSplice) {
-    if (N) {
-      if (L) {
-	skipLines(L, includeInSplice);
-      }
-      else {
-	if (includeInSplice && ! inSplice) {
-	  enterSplice();
-	}
-	if (inSplice) {
-	  putCurLineInSplice();
-	}
-	curCol += N;
-	//debugPrint("skip");
-      }
-    }
-  }
-
-  function removeLines(L) {
-    var removed = '';
-    if (L) {
-      if (! inSplice) {
-	enterSplice();
-      }
-      function nextKLinesText(k) {
-	var m = curSplice[0] + curSplice[1];
-	return lines_slice(m, m+k).join('');
-      }
-      if (isCurLineInSplice()) {
-	//print(curCol);
-	if (curCol == 0) {
-	  removed = curSplice[curSplice.length-1];
-	  // print("FOO"); // case foo
-	  curSplice.length--;
-	  removed += nextKLinesText(L-1);
-	  curSplice[1] += L-1;
-	}
-	else {
-	  removed = nextKLinesText(L-1);
-	  curSplice[1] += L-1;
-	  var sline = curSplice.length - 1;
-	  removed = curSplice[sline].substring(curCol) + removed;
-	  curSplice[sline] = curSplice[sline].substring(0, curCol) +
-	    lines_get(curSplice[0] + curSplice[1]);
-	  curSplice[1] += 1;
-	}
-      }
-      else {
-	removed = nextKLinesText(L);
-	curSplice[1] += L;
-      }
-      //debugPrint("remove");
-    }
-    return removed;
-  }
-
-  function remove(N, L) {
-    var removed = '';
-    if (N) {
-      if (L) {
-	return removeLines(L);
-      }
-      else {
-	if (! inSplice) {
-	  enterSplice();
-	}
-	var sline = putCurLineInSplice();
-	removed = curSplice[sline].substring(curCol, curCol+N);
-	curSplice[sline] = curSplice[sline].substring(0, curCol) +
-	  curSplice[sline].substring(curCol+N);
-	//debugPrint("remove");
-      }
-    }
-    return removed;
-  }
-
-  function insert(text, L) {
-    if (text) {
-      if (! inSplice) {
-	enterSplice();
-      }
-      if (L) {
-	var newLines = Changeset.splitTextLines(text);
-	if (isCurLineInSplice()) {
-	  //if (curCol == 0) {
-	  //curSplice.length--;
-	  //curSplice[1]--;
-	  //Array.prototype.push.apply(curSplice, newLines);
-	  //curLine += newLines.length;
-	  //}
-	  //else {
-	  var sline = curSplice.length - 1;
-	  var theLine = curSplice[sline];
-	  var lineCol = curCol;
-	  curSplice[sline] = theLine.substring(0, lineCol) + newLines[0];
-	  curLine++;
-	  newLines.splice(0, 1);
-	  Array.prototype.push.apply(curSplice, newLines);
-	  curLine += newLines.length;
-	  curSplice.push(theLine.substring(lineCol));
-	  curCol = 0;
-	  //}
-	}
-	else {
-	  Array.prototype.push.apply(curSplice, newLines);
-	  curLine += newLines.length;
-	}
-      }
-      else {
-	var sline = putCurLineInSplice();
-	curSplice[sline] = curSplice[sline].substring(0, curCol) +
-	  text + curSplice[sline].substring(curCol);
-	curCol += text.length;
-      }
-      //debugPrint("insert");
-    }
-  }
-
-  function hasMore() {
-    //print(lines.length+" / "+inSplice+" / "+(curSplice.length - 2)+" / "+curSplice[1]);
-    var docLines = lines_length();
-    if (inSplice) {
-      docLines += curSplice.length - 2 - curSplice[1];
-    }
-    return curLine < docLines;
-  }
-
-  function close() {
-    if (inSplice) {
-      leaveSplice();
-    }
-    //debugPrint("close");
-  }
-
-  var self = {skip:skip, remove:remove, insert:insert, close:close, hasMore:hasMore,
-    removeLines:removeLines, skipLines: skipLines};
-  return self;
-};
-
-Changeset.applyZip = function(in1, idx1, in2, idx2, func) {
-  var iter1 = Changeset.opIterator(in1, idx1);
-  var iter2 = Changeset.opIterator(in2, idx2);
-  var assem = Changeset.smartOpAssembler();
-  var op1 = Changeset.newOp();
-  var op2 = Changeset.newOp();
-  var opOut = Changeset.newOp();
-  while (op1.opcode || iter1.hasNext() || op2.opcode || iter2.hasNext()) {
-    if ((! op1.opcode) && iter1.hasNext()) iter1.next(op1);
-    if ((! op2.opcode) && iter2.hasNext()) iter2.next(op2);
-    func(op1, op2, opOut);
-    if (opOut.opcode) {
-      //print(opOut.toSource());
-      assem.append(opOut);
-      opOut.opcode = '';
-    }
-  }
-  assem.endDocument();
-  return assem.toString();
-};
-
-Changeset.unpack = function(cs) {
-  var headerRegex = /Z:([0-9a-z]+)([><])([0-9a-z]+)|/;
-  var headerMatch = headerRegex.exec(cs);
-  if ((! headerMatch) || (! headerMatch[0])) {
-    Changeset.error("Not a changeset: "+cs);
-  }
-  var oldLen = Changeset.parseNum(headerMatch[1]);
-  var changeSign = (headerMatch[2] == '>') ? 1 : -1;
-  var changeMag = Changeset.parseNum(headerMatch[3]);
-  var newLen = oldLen + changeSign*changeMag;
-  var opsStart = headerMatch[0].length;
-  var opsEnd = cs.indexOf("$");
-  if (opsEnd < 0) opsEnd = cs.length;
-  return {oldLen: oldLen, newLen: newLen, ops: cs.substring(opsStart, opsEnd),
-	  charBank: cs.substring(opsEnd+1)};
-};
-
-Changeset.pack = function(oldLen, newLen, opsStr, bank) {
-  var lenDiff = newLen - oldLen;
-  var lenDiffStr = (lenDiff >= 0 ?
-		    '>'+Changeset.numToString(lenDiff) :
-		    '<'+Changeset.numToString(-lenDiff));
-  var a = [];
-  a.push('Z:', Changeset.numToString(oldLen), lenDiffStr, opsStr, '$', bank);
-  return a.join('');
-};
-
-Changeset.applyToText = function(cs, str) {
-  var unpacked = Changeset.unpack(cs);
-  Changeset.assert(str.length == unpacked.oldLen,
-		   "mismatched apply: ",str.length," / ",unpacked.oldLen);
-  var csIter = Changeset.opIterator(unpacked.ops);
-  var bankIter = Changeset.stringIterator(unpacked.charBank);
-  var strIter = Changeset.stringIterator(str);
-  var assem = Changeset.stringAssembler();
-  while (csIter.hasNext()) {
-    var op = csIter.next();
-    switch(op.opcode) {
-    case '+': assem.append(bankIter.take(op.chars)); break;
-    case '-': strIter.skip(op.chars); break;
-    case '=': assem.append(strIter.take(op.chars)); break;
-    }
-  }
-  assem.append(strIter.take(strIter.remaining()));
-  return assem.toString();
-};
-
-Changeset.mutateTextLines = function(cs, lines) {
-  var unpacked = Changeset.unpack(cs);
-  var csIter = Changeset.opIterator(unpacked.ops);
-  var bankIter = Changeset.stringIterator(unpacked.charBank);
-  var mut = Changeset.textLinesMutator(lines);
-  while (csIter.hasNext()) {
-    var op = csIter.next();
-    switch(op.opcode) {
-    case '+': mut.insert(bankIter.take(op.chars), op.lines); break;
-    case '-': mut.remove(op.chars, op.lines); break;
-    case '=': mut.skip(op.chars, op.lines, (!! op.attribs)); break;
-    }
-  }
-  mut.close();
-};
-
-Changeset.composeAttributes = function(att1, att2, resultIsMutation, pool) {
-  // att1 and att2 are strings like "*3*f*1c", asMutation is a boolean.
-
-  // Sometimes attribute (key,value) pairs are treated as attribute presence
-  // information, while other times they are treated as operations that
-  // mutate a set of attributes, and this affects whether an empty value
-  // is a deletion or a change.
-  // Examples, of the form (att1Items, att2Items, resultIsMutation) -> result
-  // ([], [(bold, )], true) -> [(bold, )]
-  // ([], [(bold, )], false) -> []
-  // ([], [(bold, true)], true) -> [(bold, true)]
-  // ([], [(bold, true)], false) -> [(bold, true)]
-  // ([(bold, true)], [(bold, )], true) -> [(bold, )]
-  // ([(bold, true)], [(bold, )], false) -> []
-
-  // pool can be null if att2 has no attributes.
-
-  if ((! att1) && resultIsMutation) {
-    // In the case of a mutation (i.e. composing two changesets),
-    // an att2 composed with an empy att1 is just att2.  If att1
-    // is part of an attribution string, then att2 may remove
-    // attributes that are already gone, so don't do this optimization.
-    return att2;
-  }
-  if (! att2) return att1;
-  var atts = [];
-  att1.replace(/\*([0-9a-z]+)/g, function(_, a) {
-    atts.push(pool.getAttrib(Changeset.parseNum(a)));
-    return '';
-  });
-  att2.replace(/\*([0-9a-z]+)/g, function(_, a) {
-    var pair = pool.getAttrib(Changeset.parseNum(a));
-    var found = false;
-    for(var i=0;i<atts.length;i++) {
-      var oldPair = atts[i];
-      if (oldPair[0] == pair[0]) {
-	if (pair[1] || resultIsMutation) {
-	  oldPair[1] = pair[1];
-	}
-	else {
-	  atts.splice(i, 1);
-	}
-	found = true;
-	break;
-      }
-    }
-    if ((! found) && (pair[1] || resultIsMutation)) {
-      atts.push(pair);
-    }
-    return '';
-  });
-  atts.sort();
-  var buf = Changeset.stringAssembler();
-  for(var i=0;i<atts.length;i++) {
-    buf.append('*');
-    buf.append(Changeset.numToString(pool.putAttrib(atts[i])));
-  }
-  //print(att1+" / "+att2+" / "+buf.toString());
-  return buf.toString();
-};
-
-Changeset._slicerZipperFunc = function(attOp, csOp, opOut, pool) {
-  // attOp is the op from the sequence that is being operated on, either an
-  // attribution string or the earlier of two changesets being composed.
-  // pool can be null if definitely not needed.
-
-  //print(csOp.toSource()+" "+attOp.toSource()+" "+opOut.toSource());
-  if (attOp.opcode == '-') {
-    Changeset.copyOp(attOp, opOut);
-    attOp.opcode = '';
-  }
-  else if (! attOp.opcode) {
-    Changeset.copyOp(csOp, opOut);
-    csOp.opcode = '';
-  }
-  else {
-    switch (csOp.opcode) {
-    case '-': {
-      if (csOp.chars <= attOp.chars) {
-	// delete or delete part
-	if (attOp.opcode == '=') {
-	  opOut.opcode = '-';
-	  opOut.chars = csOp.chars;
-	  opOut.lines = csOp.lines;
-	  opOut.attribs = '';
-	}
-	attOp.chars -= csOp.chars;
-	attOp.lines -= csOp.lines;
-	csOp.opcode = '';
-	if (! attOp.chars) {
-	  attOp.opcode = '';
-	}
-      }
-      else {
-	// delete and keep going
-	if (attOp.opcode == '=') {
-	  opOut.opcode = '-';
-	  opOut.chars = attOp.chars;
-	  opOut.lines = attOp.lines;
-	  opOut.attribs = '';
-	}
-	csOp.chars -= attOp.chars;
-	csOp.lines -= attOp.lines;
-	attOp.opcode = '';
-      }
-      break;
-    }
-    case '+': {
-      // insert
-      Changeset.copyOp(csOp, opOut);
-      csOp.opcode = '';
-      break;
-    }
-    case '=': {
-      if (csOp.chars <= attOp.chars) {
-	// keep or keep part
-	opOut.opcode = attOp.opcode;
-	opOut.chars = csOp.chars;
-	opOut.lines = csOp.lines;
-	opOut.attribs = Changeset.composeAttributes(attOp.attribs, csOp.attribs,
-						    attOp.opcode == '=', pool);
-	csOp.opcode = '';
-	attOp.chars -= csOp.chars;
-	attOp.lines -= csOp.lines;
-	if (! attOp.chars) {
-	  attOp.opcode = '';
-	}
-      }
-      else {
-	// keep and keep going
-	opOut.opcode = attOp.opcode;
-	opOut.chars = attOp.chars;
-	opOut.lines = attOp.lines;
-	opOut.attribs = Changeset.composeAttributes(attOp.attribs, csOp.attribs,
-						    attOp.opcode == '=', pool);
-	attOp.opcode = '';
-	csOp.chars -= attOp.chars;
-	csOp.lines -= attOp.lines;
-      }
-      break;
-    }
-    case '': {
-      Changeset.copyOp(attOp, opOut);
-      attOp.opcode = '';
-      break;
-    }
-    }
-  }
-};
-
-Changeset.applyToAttribution = function(cs, astr, pool) {
-  var unpacked = Changeset.unpack(cs);
-
-  return Changeset.applyZip(astr, 0, unpacked.ops, 0, function(op1, op2, opOut) {
-    return Changeset._slicerZipperFunc(op1, op2, opOut, pool);
-  });
-};
-
-/*Changeset.oneInsertedLineAtATimeOpIterator = function(opsStr, optStartIndex, charBank) {
-  var iter = Changeset.opIterator(opsStr, optStartIndex);
-  var bankIndex = 0;
-
-};*/
-
-Changeset.mutateAttributionLines = function(cs, lines, pool) {
-  //dmesg(cs);
-  //dmesg(lines.toSource()+" ->");
-
-  var unpacked = Changeset.unpack(cs);
-  var csIter = Changeset.opIterator(unpacked.ops);
-  var csBank = unpacked.charBank;
-  var csBankIndex = 0;
-  // treat the attribution lines as text lines, mutating a line at a time
-  var mut = Changeset.textLinesMutator(lines);
-
-  var lineIter = null;
-  function isNextMutOp() {
-    return (lineIter && lineIter.hasNext()) || mut.hasMore();
-  }
-  function nextMutOp(destOp) {
-    if ((!(lineIter && lineIter.hasNext())) && mut.hasMore()) {
-      var line = mut.removeLines(1);
-      lineIter = Changeset.opIterator(line);
-    }
-    if (lineIter && lineIter.hasNext()) {
-      lineIter.next(destOp);
-    }
-    else {
-      destOp.opcode = '';
-    }
-  }
-  var lineAssem = null;
-  function outputMutOp(op) {
-    //print("outputMutOp: "+op.toSource());
-    if (! lineAssem) {
-      lineAssem = Changeset.mergingOpAssembler();
-    }
-    lineAssem.append(op);
-    if (op.lines > 0) {
-      Changeset.assert(op.lines == 1, "Can't have op.lines of ",op.lines," in attribution lines");
-      // ship it to the mut
-      mut.insert(lineAssem.toString(), 1);
-      lineAssem = null;
-    }
-  }
-
-  var csOp = Changeset.newOp();
-  var attOp = Changeset.newOp();
-  var opOut = Changeset.newOp();
-  while (csOp.opcode || csIter.hasNext() || attOp.opcode || isNextMutOp()) {
-    if ((! csOp.opcode) && csIter.hasNext()) {
-      csIter.next(csOp);
-    }
-    //print(csOp.toSource()+" "+attOp.toSource()+" "+opOut.toSource());
-    //print(csOp.opcode+"/"+csOp.lines+"/"+csOp.attribs+"/"+lineAssem+"/"+lineIter+"/"+(lineIter?lineIter.hasNext():null));
-    //print("csOp: "+csOp.toSource());
-    if ((! csOp.opcode) && (! attOp.opcode) &&
-	(! lineAssem) && (! (lineIter && lineIter.hasNext()))) {
-      break; // done
-    }
-    else if (csOp.opcode == '=' && csOp.lines > 0 && (! csOp.attribs) && (! attOp.opcode) &&
-	     (! lineAssem) && (! (lineIter && lineIter.hasNext()))) {
-      // skip multiple lines; this is what makes small changes not order of the document size
-      mut.skipLines(csOp.lines);
-      //print("skipped: "+csOp.lines);
-      csOp.opcode = '';
-    }
-    else if (csOp.opcode == '+') {
-      if (csOp.lines > 1) {
-	var firstLineLen = csBank.indexOf('\n', csBankIndex) + 1 - csBankIndex;
-	Changeset.copyOp(csOp, opOut);
-	csOp.chars -= firstLineLen;
-	csOp.lines--;
-	opOut.lines = 1;
-	opOut.chars = firstLineLen;
-      }
-      else {
-	Changeset.copyOp(csOp, opOut);
-	csOp.opcode = '';
-      }
-      outputMutOp(opOut);
-      csBankIndex += opOut.chars;
-      opOut.opcode = '';
-    }
-    else {
-      if ((! attOp.opcode) && isNextMutOp()) {
-	nextMutOp(attOp);
-      }
-      //print("attOp: "+attOp.toSource());
-      Changeset._slicerZipperFunc(attOp, csOp, opOut, pool);
-      if (opOut.opcode) {
-	outputMutOp(opOut);
-	opOut.opcode = '';
-      }
-    }
-  }
-
-  Changeset.assert(! lineAssem, "line assembler not finished");
-  mut.close();
-
-  //dmesg("-> "+lines.toSource());
-};
-
-Changeset.joinAttributionLines = function(theAlines) {
-  var assem = Changeset.mergingOpAssembler();
-  for(var i=0;i<theAlines.length;i++) {
-    var aline = theAlines[i];
-    var iter = Changeset.opIterator(aline);
-    while (iter.hasNext()) {
-      assem.append(iter.next());
-    }
-  }
-  return assem.toString();
-};
-
-Changeset.splitAttributionLines = function(attrOps, text) {
-  var iter = Changeset.opIterator(attrOps);
-  var assem = Changeset.mergingOpAssembler();
-  var lines = [];
-  var pos = 0;
-
-  function appendOp(op) {
-    assem.append(op);
-    if (op.lines > 0) {
-      lines.push(assem.toString());
-      assem.clear();
-    }
-    pos += op.chars;
-  }
-
-  while (iter.hasNext()) {
-    var op = iter.next();
-    var numChars = op.chars;
-    var numLines = op.lines;
-    while (numLines > 1) {
-      var newlineEnd = text.indexOf('\n', pos)+1;
-      Changeset.assert(newlineEnd > 0, "newlineEnd <= 0 in splitAttributionLines");
-      op.chars = newlineEnd - pos;
-      op.lines = 1;
-      appendOp(op);
-      numChars -= op.chars;
-      numLines -= op.lines;
-    }
-    if (numLines == 1) {
-      op.chars = numChars;
-      op.lines = 1;
-    }
-    appendOp(op);
-  }
-
-  return lines;
-};
-
-Changeset.splitTextLines = function(text) {
-  return text.match(/[^\n]*(?:\n|[^\n]$)/g);
-};
-
-Changeset.compose = function(cs1, cs2, pool) {
-  var unpacked1 = Changeset.unpack(cs1);
-  var unpacked2 = Changeset.unpack(cs2);
-  var len1 = unpacked1.oldLen;
-  var len2 = unpacked1.newLen;
-  Changeset.assert(len2 == unpacked2.oldLen, "mismatched composition");
-  var len3 = unpacked2.newLen;
-  var bankIter1 = Changeset.stringIterator(unpacked1.charBank);
-  var bankIter2 = Changeset.stringIterator(unpacked2.charBank);
-  var bankAssem = Changeset.stringAssembler();
-
-  var newOps = Changeset.applyZip(unpacked1.ops, 0, unpacked2.ops, 0, function(op1, op2, opOut) {
-    //var debugBuilder = Changeset.stringAssembler();
-    //debugBuilder.append(Changeset.opString(op1));
-    //debugBuilder.append(',');
-    //debugBuilder.append(Changeset.opString(op2));
-    //debugBuilder.append(' / ');
-
-    var op1code = op1.opcode;
-    var op2code = op2.opcode;
-    if (op1code == '+' && op2code == '-') {
-      bankIter1.skip(Math.min(op1.chars, op2.chars));
-    }
-    Changeset._slicerZipperFunc(op1, op2, opOut, pool);
-    if (opOut.opcode == '+') {
-      if (op2code == '+') {
-	bankAssem.append(bankIter2.take(opOut.chars));
-      }
-      else {
-	bankAssem.append(bankIter1.take(opOut.chars));
-      }
-    }
-
-    //debugBuilder.append(Changeset.opString(op1));
-    //debugBuilder.append(',');
-    //debugBuilder.append(Changeset.opString(op2));
-    //debugBuilder.append(' -> ');
-    //debugBuilder.append(Changeset.opString(opOut));
-    //print(debugBuilder.toString());
-  });
-
-  return Changeset.pack(len1, len3, newOps, bankAssem.toString());
-};
-
-Changeset.attributeTester = function(attribPair, pool) {
-  // returns a function that tests if a string of attributes
-  // (e.g. *3*4) contains a given attribute key,value that
-  // is already present in the pool.
-  if (! pool) {
-    return never;
-  }
-  var attribNum = pool.putAttrib(attribPair, true);
-  if (attribNum < 0) {
-    return never;
-  }
-  else {
-    var re = new RegExp('\\*'+Changeset.numToString(attribNum)+
-                        '(?!\\w)');
-    return function(attribs) {
-      return re.test(attribs);
-    };
-  }
-  function never(attribs) { return false; }
-};
-
-Changeset.identity = function(N) {
-  return Changeset.pack(N, N, "", "");
-};
-
-Changeset.makeSplice = function(oldFullText, spliceStart, numRemoved, newText, optNewTextAPairs, pool) {
-  var oldLen = oldFullText.length;
-
-  if (spliceStart >= oldLen) {
-    spliceStart = oldLen - 1;
-  }
-  if (numRemoved > oldFullText.length - spliceStart - 1) {
-    numRemoved = oldFullText.length - spliceStart - 1;
-  }
-  var oldText = oldFullText.substring(spliceStart, spliceStart+numRemoved);
-  var newLen = oldLen + newText.length - oldText.length;
-
-  var assem = Changeset.smartOpAssembler();
-  assem.appendOpWithText('=', oldFullText.substring(0, spliceStart));
-  assem.appendOpWithText('-', oldText);
-  assem.appendOpWithText('+', newText, optNewTextAPairs, pool);
-  assem.endDocument();
-  return Changeset.pack(oldLen, newLen, assem.toString(), newText);
-};
-
-Changeset.toSplices = function(cs) {
-  // get a list of splices, [startChar, endChar, newText]
-
-  var unpacked = Changeset.unpack(cs);
-  var splices = [];
-
-  var oldPos = 0;
-  var iter = Changeset.opIterator(unpacked.ops);
-  var charIter = Changeset.stringIterator(unpacked.charBank);
-  var inSplice = false;
-  while (iter.hasNext()) {
-    var op = iter.next();
-    if (op.opcode == '=') {
-      oldPos += op.chars;
-      inSplice = false;
-    }
-    else {
-      if (! inSplice) {
-	splices.push([oldPos, oldPos, ""]);
-	inSplice = true;
-      }
-      if (op.opcode == '-') {
-	oldPos += op.chars;
-	splices[splices.length-1][1] += op.chars;
-      }
-      else if (op.opcode == '+') {
-	splices[splices.length-1][2] += charIter.take(op.chars);
-      }
-    }
-  }
-
-  return splices;
-};
-
-Changeset.characterRangeFollow = function(cs, startChar, endChar, insertionsAfter) {
-  var newStartChar = startChar;
-  var newEndChar = endChar;
-  var splices = Changeset.toSplices(cs);
-  var lengthChangeSoFar = 0;
-  for(var i=0;i<splices.length;i++) {
-    var splice = splices[i];
-    var spliceStart = splice[0] + lengthChangeSoFar;
-    var spliceEnd = splice[1] + lengthChangeSoFar;
-    var newTextLength = splice[2].length;
-    var thisLengthChange = newTextLength - (spliceEnd - spliceStart);
-
-    if (spliceStart <= newStartChar && spliceEnd >= newEndChar) {
-      // splice fully replaces/deletes range
-      // (also case that handles insertion at a collapsed selection)
-      if (insertionsAfter) {
-	newStartChar = newEndChar = spliceStart;
-      }
-      else {
-	newStartChar = newEndChar = spliceStart + newTextLength;
-      }
-    }
-    else if (spliceEnd <= newStartChar) {
-      // splice is before range
-      newStartChar += thisLengthChange;
-      newEndChar += thisLengthChange;
-    }
-    else if (spliceStart >= newEndChar) {
-      // splice is after range
-    }
-    else if (spliceStart >= newStartChar && spliceEnd <= newEndChar) {
-      // splice is inside range
-      newEndChar += thisLengthChange;
-    }
-    else if (spliceEnd < newEndChar) {
-      // splice overlaps beginning of range
-      newStartChar = spliceStart + newTextLength;
-      newEndChar += thisLengthChange;
-    }
-    else {
-      // splice overlaps end of range
-      newEndChar = spliceStart;
-    }
-
-    lengthChangeSoFar += thisLengthChange;
-  }
-
-  return [newStartChar, newEndChar];
-};
-
-Changeset.moveOpsToNewPool = function(cs, oldPool, newPool) {
-  // works on changeset or attribution string
-  var dollarPos = cs.indexOf('$');
-  if (dollarPos < 0) {
-    dollarPos = cs.length;
-  }
-  var upToDollar = cs.substring(0, dollarPos);
-  var fromDollar = cs.substring(dollarPos);
-  // order of attribs stays the same
-  return upToDollar.replace(/\*([0-9a-z]+)/g, function(_, a) {
-    var oldNum = Changeset.parseNum(a);
-    var pair = oldPool.getAttrib(oldNum);
-    var newNum = newPool.putAttrib(pair);
-    return '*'+Changeset.numToString(newNum);
-  }) + fromDollar;
-};
-
-Changeset.makeAttribution = function(text) {
-  var assem = Changeset.smartOpAssembler();
-  assem.appendOpWithText('+', text);
-  return assem.toString();
-};
-
-// callable on a changeset, attribution string, or attribs property of an op
-Changeset.eachAttribNumber = function(cs, func) {
-  var dollarPos = cs.indexOf('$');
-  if (dollarPos < 0) {
-    dollarPos = cs.length;
-  }
-  var upToDollar = cs.substring(0, dollarPos);
-
-  upToDollar.replace(/\*([0-9a-z]+)/g, function(_, a) {
-    func(Changeset.parseNum(a));
-    return '';
-  });
-};
-
-// callable on a changeset, attribution string, or attribs property of an op,
-// though it may easily create adjacent ops that can be merged.
-Changeset.filterAttribNumbers = function(cs, filter) {
-  return Changeset.mapAttribNumbers(cs, filter);
-};
-
-Changeset.mapAttribNumbers = function(cs, func) {
-  var dollarPos = cs.indexOf('$');
-  if (dollarPos < 0) {
-    dollarPos = cs.length;
-  }
-  var upToDollar = cs.substring(0, dollarPos);
-
-  var newUpToDollar = upToDollar.replace(/\*([0-9a-z]+)/g, function(s, a) {
-    var n = func(Changeset.parseNum(a));
-    if (n === true) {
-      return s;
-    }
-    else if ((typeof n) === "number") {
-      return '*'+Changeset.numToString(n);
-    }
-    else {
-      return '';
-    }
-  });
-
-  return newUpToDollar + cs.substring(dollarPos);
-};
-
-Changeset.makeAText = function(text, attribs) {
-  return { text: text, attribs: (attribs || Changeset.makeAttribution(text)) };
-};
-
-Changeset.applyToAText = function(cs, atext, pool) {
-  return { text: Changeset.applyToText(cs, atext.text),
-	   attribs: Changeset.applyToAttribution(cs, atext.attribs, pool) };
-};
-
-Changeset.cloneAText = function(atext) {
-  return { text: atext.text, attribs: atext.attribs };
-};
-
-Changeset.copyAText = function(atext1, atext2) {
-  atext2.text = atext1.text;
-  atext2.attribs = atext1.attribs;
-};
-
-Changeset.appendATextToAssembler = function(atext, assem) {
-  // intentionally skips last newline char of atext
-  var iter = Changeset.opIterator(atext.attribs);
-  var op = Changeset.newOp();
-  while (iter.hasNext()) {
-    iter.next(op);
-    if (! iter.hasNext()) {
-      // last op, exclude final newline
-      if (op.lines <= 1) {
-	op.lines = 0;
-	op.chars--;
-	if (op.chars) {
-	  assem.append(op);
-	}
-      }
-      else {
-	var nextToLastNewlineEnd =
-	  atext.text.lastIndexOf('\n', atext.text.length-2) + 1;
-	var lastLineLength = atext.text.length - nextToLastNewlineEnd - 1;
-	op.lines--;
-	op.chars -= (lastLineLength + 1);
-	assem.append(op);
-	op.lines = 0;
-	op.chars = lastLineLength;
-	if (op.chars) {
-	  assem.append(op);
-	}
-      }
-    }
-    else {
-      assem.append(op);
-    }
-  }
-};
-
-Changeset.prepareForWire = function(cs, pool) {
-  var newPool = new AttribPool();
-  var newCs = Changeset.moveOpsToNewPool(cs, pool, newPool);
-  return {translated: newCs, pool: newPool};
-};
-
-Changeset.isIdentity = function(cs) {
-  var unpacked = Changeset.unpack(cs);
-  return unpacked.ops == "" && unpacked.oldLen == unpacked.newLen;
-};
-
-Changeset.opAttributeValue = function(op, key, pool) {
-  return Changeset.attribsAttributeValue(op.attribs, key, pool);
-};
-
-Changeset.attribsAttributeValue = function(attribs, key, pool) {
-  var value = '';
-  if (attribs) {
-    Changeset.eachAttribNumber(attribs, function(n) {
-      if (pool.getAttribKey(n) == key) {
-        value = pool.getAttribValue(n);
-      }
-    });
-  }
-  return value;
-};
-
-Changeset.builder = function(oldLen) {
-  var assem = Changeset.smartOpAssembler();
-  var o = Changeset.newOp();
-  var charBank = Changeset.stringAssembler();
-
-  var self = {
-    // attribs are [[key1,value1],[key2,value2],...] or '*0*1...' (no pool needed in latter case)
-    keep: function(N, L, attribs, pool) {
-      o.opcode = '=';
-      o.attribs = (attribs &&
-                   Changeset.makeAttribsString('=', attribs, pool)) || '';
-      o.chars = N;
-      o.lines = (L || 0);
-      assem.append(o);
-      return self;
-    },
-    keepText: function(text, attribs, pool) {
-      assem.appendOpWithText('=', text, attribs, pool);
-      return self;
-    },
-    insert: function(text, attribs, pool) {
-      assem.appendOpWithText('+', text, attribs, pool);
-      charBank.append(text);
-      return self;
-    },
-    remove: function(N, L) {
-      o.opcode = '-';
-      o.attribs = '';
-      o.chars = N;
-      o.lines = (L || 0);
-      assem.append(o);
-      return self;
-    },
-    toString: function() {
-      assem.endDocument();
-      var newLen = oldLen + assem.getLengthChange();
-      return Changeset.pack(oldLen, newLen, assem.toString(),
-			    charBank.toString());
-    }
-  };
-
-  return self;
-};
-
-Changeset.makeAttribsString = function(opcode, attribs, pool) {
-  // makeAttribsString(opcode, '*3') or makeAttribsString(opcode, [['foo','bar']], myPool) work
-  if (! attribs) {
-    return '';
-  }
-  else if ((typeof attribs) == "string") {
-    return attribs;
-  }
-  else if (pool && attribs && attribs.length) {
-    if (attribs.length > 1) {
-      attribs = attribs.slice();
-      attribs.sort();
-    }
-    var result = [];
-    for(var i=0;i<attribs.length;i++) {
-      var pair = attribs[i];
-      if (opcode == '=' || (opcode == '+' && pair[1])) {
-	result.push('*'+Changeset.numToString(pool.putAttrib(pair)));
-      }
-    }
-    return result.join('');
-  }
-};
-
-// like "substring" but on a single-line attribution string
-Changeset.subattribution = function(astr, start, optEnd) {
-  var iter = Changeset.opIterator(astr, 0);
-  var assem = Changeset.smartOpAssembler();
-  var attOp = Changeset.newOp();
-  var csOp = Changeset.newOp();
-  var opOut = Changeset.newOp();
-
-  function doCsOp() {
-    if (csOp.chars) {
-      while (csOp.opcode && (attOp.opcode || iter.hasNext())) {
-	if (! attOp.opcode) iter.next(attOp);
-
-	if (csOp.opcode && attOp.opcode && csOp.chars >= attOp.chars &&
-	    attOp.lines > 0 && csOp.lines <= 0) {
-	  csOp.lines++;
-	}
-
-	Changeset._slicerZipperFunc(attOp, csOp, opOut, null);
-	if (opOut.opcode) {
-	  assem.append(opOut);
-	  opOut.opcode = '';
-	}
-      }
-    }
-  }
-
-  csOp.opcode = '-';
-  csOp.chars = start;
-
-  doCsOp();
-
-  if (optEnd === undefined) {
-    if (attOp.opcode) {
-      assem.append(attOp);
-    }
-    while (iter.hasNext()) {
-      iter.next(attOp);
-      assem.append(attOp);
-    }
-  }
-  else {
-    csOp.opcode = '=';
-    csOp.chars = optEnd - start;
-    doCsOp();
-  }
-
-  return assem.toString();
-};
-
-Changeset.inverse = function(cs, lines, alines, pool) {
-  // lines and alines are what the changeset is meant to apply to.
-  // They may be arrays or objects with .get(i) and .length methods.
-  // They include final newlines on lines.
-  function lines_get(idx) {
-    if (lines.get) {
-      return lines.get(idx);
-    }
-    else {
-      return lines[idx];
-    }
-  }
-  function lines_length() {
-    if ((typeof lines.length) == "number") {
-      return lines.length;
-    }
-    else {
-      return lines.length();
-    }
-  }
-  function alines_get(idx) {
-    if (alines.get) {
-      return alines.get(idx);
-    }
-    else {
-      return alines[idx];
-    }
-  }
-  function alines_length() {
-    if ((typeof alines.length) == "number") {
-      return alines.length;
-    }
-    else {
-      return alines.length();
-    }
-  }
-
-  var curLine = 0;
-  var curChar = 0;
-  var curLineOpIter = null;
-  var curLineOpIterLine;
-  var curLineNextOp = Changeset.newOp('+');
-
-  var unpacked = Changeset.unpack(cs);
-  var csIter = Changeset.opIterator(unpacked.ops);
-  var builder = Changeset.builder(unpacked.newLen);
-
-  function consumeAttribRuns(numChars, func/*(len, attribs, endsLine)*/) {
-
-    if ((! curLineOpIter) || (curLineOpIterLine != curLine)) {
-      // create curLineOpIter and advance it to curChar
-      curLineOpIter = Changeset.opIterator(alines_get(curLine));
-      curLineOpIterLine = curLine;
-      var indexIntoLine = 0;
-      var done = false;
-      while (! done) {
-	curLineOpIter.next(curLineNextOp);
-	if (indexIntoLine + curLineNextOp.chars >= curChar) {
-	  curLineNextOp.chars -= (curChar - indexIntoLine);
-	  done = true;
-	}
-	else {
-	  indexIntoLine += curLineNextOp.chars;
-	}
-      }
-    }
-
-    while (numChars > 0) {
-      if ((! curLineNextOp.chars) && (! curLineOpIter.hasNext())) {
-	curLine++;
-	curChar = 0;
-	curLineOpIterLine = curLine;
-	curLineNextOp.chars = 0;
-	curLineOpIter = Changeset.opIterator(alines_get(curLine));
-      }
-      if (! curLineNextOp.chars) {
-	curLineOpIter.next(curLineNextOp);
-      }
-      var charsToUse = Math.min(numChars, curLineNextOp.chars);
-      func(charsToUse, curLineNextOp.attribs,
-	   charsToUse == curLineNextOp.chars && curLineNextOp.lines > 0);
-      numChars -= charsToUse;
-      curLineNextOp.chars -= charsToUse;
-      curChar += charsToUse;
-    }
-
-    if ((! curLineNextOp.chars) && (! curLineOpIter.hasNext())) {
-      curLine++;
-      curChar = 0;
-    }
-  }
-
-  function skip(N, L) {
-    if (L) {
-      curLine += L;
-      curChar = 0;
-    }
-    else {
-      if (curLineOpIter && curLineOpIterLine == curLine) {
-	consumeAttribRuns(N, function() {});
-      }
-      else {
-	curChar += N;
-      }
-    }
-  }
-
-  function nextText(numChars) {
-    var len = 0;
-    var assem = Changeset.stringAssembler();
-    var firstString = lines_get(curLine).substring(curChar);
-    len += firstString.length;
-    assem.append(firstString);
-
-    var lineNum = curLine+1;
-    while (len < numChars) {
-      var nextString = lines_get(lineNum);
-      len += nextString.length;
-      assem.append(nextString);
-      lineNum++;
-    }
-
-    return assem.toString().substring(0, numChars);
-  }
-
-  function cachedStrFunc(func) {
-    var cache = {};
-    return function(s) {
-      if (! cache[s]) {
-	cache[s] = func(s);
-      }
-      return cache[s];
-    };
-  }
-
-  var attribKeys = [];
-  var attribValues = [];
-  while (csIter.hasNext()) {
-    var csOp = csIter.next();
-    if (csOp.opcode == '=') {
-      if (csOp.attribs) {
-	attribKeys.length = 0;
-	attribValues.length = 0;
-	Changeset.eachAttribNumber(csOp.attribs, function(n) {
-	  attribKeys.push(pool.getAttribKey(n));
-	  attribValues.push(pool.getAttribValue(n));
-	});
-	var undoBackToAttribs = cachedStrFunc(function(attribs) {
-	  var backAttribs = [];
-	  for(var i=0;i<attribKeys.length;i++) {
-	    var appliedKey = attribKeys[i];
-	    var appliedValue = attribValues[i];
-	    var oldValue = Changeset.attribsAttributeValue(attribs, appliedKey, pool);
-	    if (appliedValue != oldValue) {
-	      backAttribs.push([appliedKey, oldValue]);
-	    }
-	  }
-	  return Changeset.makeAttribsString('=', backAttribs, pool);
-	});
-	consumeAttribRuns(csOp.chars, function(len, attribs, endsLine) {
-	  builder.keep(len, endsLine ? 1 : 0, undoBackToAttribs(attribs));
-	});
-      }
-      else {
-	skip(csOp.chars, csOp.lines);
-	builder.keep(csOp.chars, csOp.lines);
-      }
-    }
-    else if (csOp.opcode == '+') {
-      builder.remove(csOp.chars, csOp.lines);
-    }
-    else if (csOp.opcode == '-') {
-      var textBank = nextText(csOp.chars);
-      var textBankIndex = 0;
-      consumeAttribRuns(csOp.chars, function(len, attribs, endsLine) {
-	builder.insert(textBank.substr(textBankIndex, len), attribs);
-	textBankIndex += len;
-      });
-    }
-  }
-
-  return Changeset.checkRep(builder.toString());
-};
diff --git a/etherpad/src/static/js/linestylefilter_client.js b/etherpad/src/static/js/linestylefilter_client.js
deleted file mode 100644
index df35c3c..0000000
--- a/etherpad/src/static/js/linestylefilter_client.js
+++ /dev/null
@@ -1,246 +0,0 @@
-// DO NOT EDIT THIS FILE, edit infrastructure/ace/www/linestylefilter.js
-
-/**
- * Copyright 2009 Google Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS-IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-// requires: easysync2.Changeset
-
-var linestylefilter = {};
-
-linestylefilter.ATTRIB_CLASSES = {
-  'bold':'tag:b',
-  'italic':'tag:i',
-  'underline':'tag:u',
-  'strikethrough':'tag:s'
-};
-
-linestylefilter.getAuthorClassName = function(author) {
-  return "author-"+author.replace(/[^a-y0-9]/g, function(c) {
-    if (c == ".") return "-";
-    return 'z'+c.charCodeAt(0)+'z';
-  });
-};
-
-// lineLength is without newline; aline includes newline,
-// but may be falsy if lineLength == 0
-linestylefilter.getLineStyleFilter = function(lineLength, aline,
-                                              textAndClassFunc, apool) {
-
-  if (lineLength == 0) return textAndClassFunc;
-
-  var nextAfterAuthorColors = textAndClassFunc;
-
-  var authorColorFunc = (function() {
-    var lineEnd = lineLength;
-    var curIndex = 0;
-    var extraClasses;
-    var leftInAuthor;
-
-    function attribsToClasses(attribs) {
-      var classes = '';
-      Changeset.eachAttribNumber(attribs, function(n) {
-	var key = apool.getAttribKey(n);
-	if (key) {
-	  var value = apool.getAttribValue(n);
-	  if (value) {
-	    if (key == 'author') {
-	      classes += ' '+linestylefilter.getAuthorClassName(value);
-	    }
-            else if (key == 'list') {
-              classes += ' list:'+value;
-            }
-	    else if (linestylefilter.ATTRIB_CLASSES[key]) {
-	      classes += ' '+linestylefilter.ATTRIB_CLASSES[key];
-	    }
-	  }
-	}
-      });
-      return classes.substring(1);
-    }
-
-    var attributionIter = Changeset.opIterator(aline);
-    var nextOp, nextOpClasses;
-    function goNextOp() {
-      nextOp = attributionIter.next();
-      nextOpClasses = (nextOp.opcode && attribsToClasses(nextOp.attribs));
-    }
-    goNextOp();
-    function nextClasses() {
-      if (curIndex < lineEnd) {
-	extraClasses = nextOpClasses;
-	leftInAuthor = nextOp.chars;
-	goNextOp();
-	while (nextOp.opcode && nextOpClasses == extraClasses) {
-	  leftInAuthor += nextOp.chars;
-	  goNextOp();
-	}
-      }
-    }
-    nextClasses();
-
-    return function(txt, cls) {
-      while (txt.length > 0) {
-	if (leftInAuthor <= 0) {
-	  // prevent infinite loop if something funny's going on
-	  return nextAfterAuthorColors(txt, cls);
-	}
-	var spanSize = txt.length;
-	if (spanSize > leftInAuthor) {
-	  spanSize = leftInAuthor;
-	}
-	var curTxt = txt.substring(0, spanSize);
-	txt = txt.substring(spanSize);
-	nextAfterAuthorColors(curTxt, (cls&&cls+" ")+extraClasses);
-	curIndex += spanSize;
-	leftInAuthor -= spanSize;
-	if (leftInAuthor == 0) {
-	  nextClasses();
-	}
-      }
-    };
-  })();
-  return authorColorFunc;
-};
-
-linestylefilter.getAtSignSplitterFilter = function(lineText,
-                                                   textAndClassFunc) {
-  var at = /@/g;
-  at.lastIndex = 0;
-  var splitPoints = null;
-  var execResult;
-  while ((execResult = at.exec(lineText))) {
-    if (! splitPoints) {
-      splitPoints = [];
-    }
-    splitPoints.push(execResult.index);
-  }
-
-  if (! splitPoints) return textAndClassFunc;
-
-  return linestylefilter.textAndClassFuncSplitter(textAndClassFunc,
-                                                  splitPoints);
-};
-
-linestylefilter.REGEX_WORDCHAR = /[\u0030-\u0039\u0041-\u005A\u0061-\u007A\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u00FF\u0100-\u1FFF\u3040-\u9FFF\uF900-\uFDFF\uFE70-\uFEFE\uFF10-\uFF19\uFF21-\uFF3A\uFF41-\uFF5A\uFF66-\uFFDC]/;
-linestylefilter.REGEX_URLCHAR = new RegExp('('+/[-:@a-zA-Z0-9_.,~%+\/\\?=&#;()$]/.source+'|'+linestylefilter.REGEX_WORDCHAR.source+')');
-linestylefilter.REGEX_URL = new RegExp(/(?:(?:https?|s?ftp|ftps|file|smb|afp|nfs|(x-)?man|gopher|txmt):\/\/|mailto:)/.source+linestylefilter.REGEX_URLCHAR.source+'*(?![:.,;])'+linestylefilter.REGEX_URLCHAR.source, 'g');
-
-linestylefilter.getURLFilter = function(lineText, textAndClassFunc) {
-  linestylefilter.REGEX_URL.lastIndex = 0;
-  var urls = null;
-  var splitPoints = null;
-  var execResult;
-  while ((execResult = linestylefilter.REGEX_URL.exec(lineText))) {
-    if (! urls) {
-      urls = [];
-      splitPoints = [];
-    }
-    var startIndex = execResult.index;
-    var url = execResult[0];
-    urls.push([startIndex, url]);
-    splitPoints.push(startIndex, startIndex + url.length);
-  }
-
-  if (! urls) return textAndClassFunc;
-
-  function urlForIndex(idx) {
-    for(var k=0; k<urls.length; k++) {
-      var u = urls[k];
-      if (idx >= u[0] && idx < u[0]+u[1].length) {
-	return u[1];
-      }
-    }
-    return false;
-  }
-
-  var handleUrlsAfterSplit = (function() {
-    var curIndex = 0;
-    return function(txt, cls) {
-      var txtlen = txt.length;
-      var newCls = cls;
-      var url = urlForIndex(curIndex);
-      if (url) {
-	newCls += " url:"+url;
-      }
-      textAndClassFunc(txt, newCls);
-      curIndex += txtlen;
-    };
-  })();
-
-  return linestylefilter.textAndClassFuncSplitter(handleUrlsAfterSplit,
-                                                  splitPoints);
-};
-
-linestylefilter.textAndClassFuncSplitter = function(func, splitPointsOpt) {
-  var nextPointIndex = 0;
-  var idx = 0;
-
-  // don't split at 0
-  while (splitPointsOpt &&
-	 nextPointIndex < splitPointsOpt.length &&
-	 splitPointsOpt[nextPointIndex] == 0) {
-    nextPointIndex++;
-  }
-
-  function spanHandler(txt, cls) {
-    if ((! splitPointsOpt) || nextPointIndex >= splitPointsOpt.length) {
-      func(txt, cls);
-      idx += txt.length;
-    }
-    else {
-      var splitPoints = splitPointsOpt;
-      var pointLocInSpan = splitPoints[nextPointIndex] - idx;
-      var txtlen = txt.length;
-      if (pointLocInSpan >= txtlen) {
-	func(txt, cls);
-	idx += txt.length;
-	if (pointLocInSpan == txtlen) {
-	  nextPointIndex++;
-	}
-      }
-      else {
-	if (pointLocInSpan > 0) {
-	  func(txt.substring(0, pointLocInSpan), cls);
-	  idx += pointLocInSpan;
-	}
-	nextPointIndex++;
-	// recurse
-	spanHandler(txt.substring(pointLocInSpan), cls);
-      }
-    }
-  }
-  return spanHandler;
-};
-
-// domLineObj is like that returned by domline.createDomLine
-linestylefilter.populateDomLine = function(textLine, aline, apool,
-                                           domLineObj) {
-  // remove final newline from text if any
-  var text = textLine;
-  if (text.slice(-1) == '\n') {
-    text = text.substring(0, text.length-1);
-  }
-
-  function textAndClassFunc(tokenText, tokenClass) {
-    domLineObj.appendSpan(tokenText, tokenClass);
-  }
-
-  var func = textAndClassFunc;
-  func = linestylefilter.getURLFilter(text, func);
-  func = linestylefilter.getLineStyleFilter(text.length, aline,
-                                            func, apool);
-  func(text, '');
-};