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-=====
-ACE2 (originally AppJet Code Editor)
-=====
-
-(This doc started Dec 2009 by dgreenspan.)
-
-ACE2 is EtherPad's editor, a content-editable-based rich text editor
-that supports IE6+, FF(2?/)3+, Safari(3?/)4+.  It supports
-collaborative editing using operation transforms (easysync2),
-undo/redo, copy/paste.
-
-The name "ACE2" is because this is a rewrite of aiba's original
-content-editable AppJet Code Editor.
-
-== Building it
-
-In this directory, run `bin/make normal etherpad` (requires scala),
-which generates `build/ace2.js` and copies this and other files into
-the etherpad source tree.  To have the script keep running and
-automatically rebuild when source files change, run `bin/make auto
-etherpad`.
-
-The original reason for the build process was that ACE needs to
-construct two nested iframes on the client, and to do this without
-incurring round-trips to the server, it programmatically loads code
-into the outer iframe that loads code into the inner iframe; so the
-bulk of ACE's code is compressed into a string literal (twice).  Later
-on, refactoring meant that the source is also divided into more than a
-dozen files that the build script combines, and some are also
-server-side EtherPad modules or client-side libraries (or both).
-
-The master copy of the operational transform (OT) library, easysync2,
-lives here.
-
-In the early days it was possible to run ACE in a sort of development
-mode, without the compression and iframe injection, by running it out
-of the 'www' directory, but this is no longer possible.
-
-== Browser support
-
-We went out of our way to support IE6+.  IE's design-mode is quite
-robust, though there are some differences in manipulation of the
-selection and insertion point and in the DOM representation we had to
-use.
-
-We don't support Opera.  Opera is a problematic case, because
-apparently JS running in different iframes is run concurrently, not
-linearized into a single event thread.  This seems to be a rather
-obscure fact and is almost difficult to believe.  As if iframes don't
-complicate scripting enough!
-
-== Syntax highlighting
-
-Though syntax highlighting predated rich text as the original
-motivation for the design of ACE, support was eventually dropped in
-EtherPad.  At first the plan was to generalize it to other programming
-languages, but the task was deprioritized (and difficult), and during
-subsequent optimization and refactoring of ACE, calls to the
-incremental lexer were stripped out because they complicated things.
-
-One plan for multi-language syntax highlighting, never implemented,
-was to calculate syntax highlighting on the server as a sort of "style
-overlay" and feed updates to the client along with updates to the
-document text.
-
-== Changeset format
-
-See easysync-notes.txt for some notes on the changeset format, which
-was redesigned with the advent of rich text.