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diff --git a/XMonad/Layout/SwitchTrans.hs b/XMonad/Layout/SwitchTrans.hs
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--- a/XMonad/Layout/SwitchTrans.hs
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-{-# OPTIONS_GHC -fglasgow-exts #-}
-
------------------------------------------------------------------------------
--- |
--- Module      :  XMonad.Layout.SwitchTrans
--- Copyright   :  (c) Lukas Mai
--- License     :  BSD-style (see LICENSE)
---
--- Maintainer  :  <l.mai@web.de>
--- Stability   :  unstable
--- Portability :  unportable
---
---
--- Ordinary layout transformers are simple and easy to use but inflexible.
--- This module provides a more structured interface to them.
---
--- The basic idea is to have a base layout and a set of layout transformers,
--- of which at most one is active at any time. Enabling another transformer
--- first disables any currently active transformer; i.e. it works like
--- a group of radio buttons.
---
--- A side effect of this meta-layout is that layout transformers no longer
--- receive any messages; any message not handled by @SwitchTrans@ itself will
--- undo the current layout transformer, pass the message on to the base layout,
--- then reapply the transformer.
---
--- Another potential problem is that functions can't be (de-)serialized so this
--- layout will not preserve state across xmonad restarts.
---
--- Here's how you might use this in Config.hs:
---
--- > layouts =
--- >     map (
--- >         mkSwitch (M.fromList [
--- >             ("full", const $ Layout $ noBorders Full)
--- >         ]) .
--- >         mkSwitch (M.fromList [
--- >             ("mirror", Layout . Mirror)
--- >         ])
--- >     ) [ Layout tiled ]
---
--- (The @noBorders@ transformer is from "XMonad.Layout.NoBorders".)
---
--- This example is probably overkill but it's very close to what I actually use.
--- Anyway, this layout behaves like the default @tiled@ layout, until you send it
--- @Enable@\/@Disable@\/@Toggle@ messages. From the definition of @keys@:
---
--- > ...
--- >    , ((modMask,               xK_f     ), sendMessage $ Toggle "full")
--- >    , ((modMask,               xK_r     ), sendMessage $ Toggle "mirror")
---
--- (You may want to use other keys. I don't use Xinerama so the default mod-r
--- binding is useless to me.)
---
--- After this, pressing @mod-f@ switches the current window to fullscreen mode.
--- Pressing @mod-f@ again switches it back. Similarly, @mod-r@ rotates the layout
--- by 90 degrees (and back). The nice thing is that your changes are kept:
--- Rotating first then changing the size of the master area then rotating back
--- does not undo the master area changes.
---
--- The reason I use two stacked @SwitchTrans@ transformers instead of @mkSwitch
--- (M.fromList [(\"full\", const $ Layout $ noBorders Full), (\"mirror\",
--- Layout . Mirror)])@ is that I use @mod-f@ to \"zoom in\" on interesting
--- windows, no matter what other layout transformers may be active. Having an
--- extra fullscreen mode on top of everything else means I can zoom in and out
--- without implicitly undoing \"normal\" layout transformers, like @Mirror@.
--- Remember, inside a @SwitchTrans@ there can be at most one active layout
--- transformer.
------------------------------------------------------------------------------
-
-module XMonad.Layout.SwitchTrans (
-    Toggle(..),
-    Enable(..),
-    Disable(..),
-    mkSwitch
-) where
-
-import XMonad
-import XMonad.Operations
-
-import qualified Data.Map as M
-import Data.Map (Map)
-
---import System.IO
-
-
--- | Toggle the specified layout transformer.
-data Toggle = Toggle String deriving (Eq, Typeable)
-instance Message Toggle
--- | Enable the specified transformer.
-data Enable = Enable String deriving (Eq, Typeable)
-instance Message Enable
--- | Disable the specified transformer.
-data Disable = Disable String deriving (Eq, Typeable)
-instance Message Disable
-
-data SwitchTrans a = SwitchTrans {
-    base :: Layout a,
-    currTag :: Maybe String,
-    currLayout :: Layout a,
-    currFilt :: Layout a -> Layout a,
-    filters :: Map String (Layout a -> Layout a)
-}
-
-instance Show (SwitchTrans a) where
-    show st = "SwitchTrans #<base: " ++ show (base st) ++ ", tag: " ++ show (currTag st) ++ ", layout: " ++ show (currLayout st) ++ ", ...>"
-
-instance Read (SwitchTrans a) where
-    readsPrec _ _ = []
-
-unLayout :: Layout a -> (forall l. (LayoutClass l a) => l a -> r) -> r
-unLayout (Layout l) k = k l
-
-acceptChange :: (LayoutClass l a) => SwitchTrans a -> ((l a -> SwitchTrans a) -> b -> c) -> X b -> X c
-acceptChange st f action =
-    -- seriously, Dave, you need to stop this
-    fmap (f (\l -> st{ currLayout = Layout l})) action
-
-instance LayoutClass SwitchTrans a where
-    description _ = "SwitchTrans"
-
-    doLayout st r s = currLayout st `unLayout` \l -> do
-        --io $ hPutStrLn stderr $ "[ST]{ " ++ show st
-        x{- @(_, w) -} <- acceptChange st (fmap . fmap) (doLayout l r s)
-        --io $ hPutStrLn stderr $ "[ST]} " ++ show w
-        return x
-
-    pureLayout st r s = currLayout st `unLayout` \l -> pureLayout l r s
-
-    handleMessage st m
-        | Just (Disable tag) <- fromMessage m
-        , M.member tag (filters st)
-            = provided (currTag st == Just tag) $ disable
-        | Just (Enable tag) <- fromMessage m
-        , Just alt <- M.lookup tag (filters st)
-            = provided (currTag st /= Just tag) $ enable tag alt
-        | Just (Toggle tag) <- fromMessage m
-        , Just alt <- M.lookup tag (filters st)
-            =
-            if (currTag st == Just tag) then
-                disable
-            else
-                enable tag alt
-        | Just ReleaseResources <- fromMessage m
-            = currLayout st `unLayout` \cl -> do
-                --io $ hPutStrLn stderr $ "[ST]~ " ++ show st
-                acceptChange st fmap (handleMessage cl m)
-        | Just Hide <- fromMessage m
-            = currLayout st `unLayout` \cl -> do
-                --io $ hPutStrLn stderr $ "[ST]< " ++ show st
-                x <- acceptChange st fmap (handleMessage cl m)
-                --io $ hPutStrLn stderr $ "[ST]> " ++ show x
-                return x
-        | otherwise = base st `unLayout` \b -> do
-            x <- handleMessage b m
-            case x of
-                Nothing -> return Nothing
-                Just b' -> currLayout st `unLayout` \cl -> do
-                    handleMessage cl (SomeMessage ReleaseResources)
-                    let b'' = Layout b'
-                    return . Just $ st{ base = b'', currLayout = currFilt st b'' }
-        where
-        enable tag alt = currLayout st `unLayout` \cl -> do
-            --io $ hPutStrLn stderr $ "[ST]+ " ++ show cl ++ " -> " ++ show (alt (base st))
-            handleMessage cl (SomeMessage ReleaseResources)
-            return . Just $ st{
-                currTag = Just tag,
-                currFilt = alt,
-                currLayout = alt (base st) }
-        disable = currLayout st `unLayout` \cl -> do
-            --io $ hPutStrLn stderr $ "[ST]- " ++ show cl ++ " -> " ++ show (base st)
-            handleMessage cl (SomeMessage ReleaseResources)
-            return . Just $ st{
-                currTag = Nothing,
-                currFilt = id,
-                currLayout = base st }
-
--- | Take a transformer table and a base layout, and return a
--- SwitchTrans layout.
-mkSwitch :: Map String (Layout a -> Layout a) -> Layout a -> Layout a
-mkSwitch fs b = Layout st
-    where
-    st = SwitchTrans{
-        base = b,
-        currTag = Nothing,
-        currLayout = b,
-        currFilt = id,
-        filters = fs }
-        
-provided :: Bool -> X (Maybe a) -> X (Maybe a)
-provided c x
-    | c = x
-    | otherwise = return Nothing
-