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+<!doctype html>
+<html>
+  <head>
+    <title>CodeMirror: Upgrading to v2.2</title>
+    <link rel="stylesheet" type="text/css" href="http://fonts.googleapis.com/css?family=Droid+Sans|Droid+Sans:bold"/>
+    <link rel="stylesheet" type="text/css" href="docs.css"/>
+    <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
+  </head>
+  <body>
+
+<h1><span class="logo-braces">{ }</span> <a href="http://codemirror.net/">CodeMirror</a></h1>
+
+<pre class="grey">
+<img src="baboon.png" class="logo" alt="logo"/>/* Upgrading to v2.2
+ */
+</pre>
+
+<div class="left">
+
+<p>There are a few things in the 2.2 release that require some care
+when upgrading.</p>
+
+<h2>No more default.css</h2>
+
+<p>The default theme is now included
+in <a href="../lib/codemirror.css"><code>codemirror.css</code></a>, so
+you do not have to included it separately anymore. (It was tiny, so
+even if you're not using it, the extra data overhead is negligible.)
+
+<h2>Different key customization</h2>
+
+<p>CodeMirror has moved to a system
+where <a href="manual.html#option_keyMap">keymaps</a> are used to
+bind behavior to keys. This means <a href="../demo/emacs.html">custom
+bindings</a> are now possible.</p>
+
+<p>Three options that influenced key
+behavior, <code>tabMode</code>, <code>enterMode</code>,
+and <code>smartHome</code>, are no longer supported. Instead, you can
+provide custom bindings to influence the way these keys act. This is
+done through the
+new <a href="manual.html#option_extraKeys"><code>extraKeys</code></a>
+option, which can hold an object mapping key names to functionality. A
+simple example would be:</p>
+
+<pre>  extraKeys: {
+    "Ctrl-S": function(instance) { saveText(instance.getValue()); },
+    "Ctrl-/": "undo"
+  }</pre>
+
+<p>Keys can be mapped either to functions, which will be given the
+editor instance as argument, or to strings, which are mapped through
+functions through the <code>CodeMirror.commands</code> table, which
+contains all the built-in editing commands, and can be inspected and
+extended by external code.</p>
+
+<p>By default, the <code>Home</code> key is bound to
+the <code>"goLineStartSmart"</code> command, which moves the cursor to
+the first non-whitespace character on the line. You can set do this to
+make it always go to the very start instead:</p>
+
+<pre>  extraKeys: {"Home": "goLineStart"}</pre>
+
+<p>Similarly, <code>Enter</code> is bound
+to <code>"newlineAndIndent"</code> by default. You can bind it to
+something else to get different behavior. To disable special handling
+completely and only get a newline character inserted, you can bind it
+to <code>false</code>:</p>
+
+<pre>  extraKeys: {"Enter": false}</pre>
+
+<p>The same works for <code>Tab</code>. If you don't want CodeMirror
+to handle it, bind it to <code>false</code>. The default behaviour is
+to indent the current line more (<code>"indentMore"</code> command),
+and indent it less when shift is held (<code>"indentLess"</code>).
+There are also <code>"indentAuto"</code> (smart indent)
+and <code>"insertTab"</code> commands provided for alternate
+behaviors. Or you can write your own handler function to do something
+different altogether.</p>
+
+<h2>Tabs</h2>
+
+<p>Handling of tabs changed completely. The display width of tabs can
+now be set with the <code>tabSize</code> option, and tabs can
+be <a href="../demo/visibletabs.html">styled</a> by setting CSS rules
+for the <code>cm-tab</code> class.</p>
+
+<p>The default width for tabs is now 4, as opposed to the 8 that is
+hard-wired into browsers. If you are relying on 8-space tabs, make
+sure you explicitly set <code>tabSize: 8</code> in your options.</p>
+
+</div>
+
+  </body>
+</html>