commit f2dd82b0d3defdedb01c5222e802d56ba47bd93f
Author: Ariya Hidayat <ariya.hidayat@gmail.com>
Date:   Tue Mar 27 17:56:26 2012 -0700

    CodeMirror version 2.23.

diff --git a/assets/codemirror/codemirror.css b/assets/codemirror/codemirror.css
index 5eadb24..2d79f4a 100644
--- a/assets/codemirror/codemirror.css
+++ b/assets/codemirror/codemirror.css
@@ -9,6 +9,7 @@
   /* This is needed to prevent an IE[67] bug where the scrolled content
      is visible outside of the scrolling box. */
   position: relative;
+  outline: none;
 }
 
 .CodeMirror-gutter {
@@ -27,6 +28,7 @@
 }
 .CodeMirror-lines {
   padding: .4em;
+  white-space: pre;
 }
 
 .CodeMirror pre {
diff --git a/assets/codemirror/codemirror.js b/assets/codemirror/codemirror.js
index 9c6e65e..5434a8d 100644
--- a/assets/codemirror/codemirror.js
+++ b/assets/codemirror/codemirror.js
@@ -1,4 +1,4 @@
-// CodeMirror version 2.22
+// CodeMirror version 2.23
 //
 // All functions that need access to the editor's state live inside
 // the CodeMirror function. Below that, at the bottom of the file,
@@ -15,9 +15,8 @@ var CodeMirror = (function() {
       if (defaults.hasOwnProperty(opt))
         options[opt] = (givenOptions && givenOptions.hasOwnProperty(opt) ? givenOptions : defaults)[opt];
 
-    var targetDocument = options["document"];
     // The element in which the editor lives.
-    var wrapper = targetDocument.createElement("div");
+    var wrapper = document.createElement("div");
     wrapper.className = "CodeMirror" + (options.lineWrapping ? " CodeMirror-wrap" : "");
     // This mess creates the base DOM structure for the editor.
     wrapper.innerHTML =
@@ -48,7 +47,10 @@ var CodeMirror = (function() {
     if (!webkit) lineSpace.draggable = true;
     lineSpace.style.outline = "none";
     if (options.tabindex != null) input.tabIndex = options.tabindex;
+    if (options.autofocus) focusInput();
     if (!options.gutter && !options.lineNumbers) gutter.style.display = "none";
+    // Needed to handle Tab key in KHTML
+    if (khtml) inputDiv.style.height = "1px", inputDiv.style.position = "absolute";
 
     // Check for problem with IE innerHTML not working when we have a
     // P (or similar) parent node.
@@ -81,12 +83,13 @@ var CodeMirror = (function() {
         gutterDirty, callbacks;
     // Current visible range (may be bigger than the view window).
     var displayOffset = 0, showingFrom = 0, showingTo = 0, lastSizeC = 0;
-    // bracketHighlighted is used to remember that a backet has been
+    // bracketHighlighted is used to remember that a bracket has been
     // marked.
     var bracketHighlighted;
     // Tracks the maximum line length so that the horizontal scrollbar
     // can be kept static when scrolling.
     var maxLine = "", maxWidth;
+    var tabCache = {};
 
     // Initialize the content.
     operation(function(){setValue(options.value || ""); updateInput = false;})();
@@ -124,10 +127,16 @@ var CodeMirror = (function() {
       if (!options.readOnly) replaceSelection("");
     }));
 
+    // Needed to handle Tab key in KHTML
+    if (khtml) connect(code, "mouseup", function() {
+        if (document.activeElement == input) input.blur();
+        focusInput();
+    });
+
     // IE throws unspecified error in certain cases, when
     // trying to access activeElement before onload
-    var hasFocus; try { hasFocus = (targetDocument.activeElement == input); } catch(e) { }
-    if (hasFocus) setTimeout(onFocus, 20);
+    var hasFocus; try { hasFocus = (document.activeElement == input); } catch(e) { }
+    if (hasFocus || options.autofocus) setTimeout(onFocus, 20);
     else onBlur();
 
     function isLine(l) {return l >= 0 && l < doc.size;}
@@ -178,17 +187,23 @@ var CodeMirror = (function() {
         line = clipLine(line == null ? doc.size - 1: line);
         return getStateBefore(line + 1);
       },
-      cursorCoords: function(start){
+      cursorCoords: function(start, mode) {
         if (start == null) start = sel.inverted;
-        return pageCoords(start ? sel.from : sel.to);
+        return this.charCoords(start ? sel.from : sel.to, mode);
+      },
+      charCoords: function(pos, mode) {
+        pos = clipPos(pos);
+        if (mode == "local") return localCoords(pos, false);
+        if (mode == "div") return localCoords(pos, true);
+        return pageCoords(pos);
       },
-      charCoords: function(pos){return pageCoords(clipPos(pos));},
       coordsChar: function(coords) {
         var off = eltOffset(lineSpace);
         return coordsChar(coords.x - off.left, coords.y - off.top);
       },
       markText: operation(markText),
       setBookmark: setBookmark,
+      findMarksAt: findMarksAt,
       setMarker: operation(addGutterMarker),
       clearMarker: operation(removeGutterMarker),
       setLineClass: operation(setLineClass),
@@ -256,6 +271,7 @@ var CodeMirror = (function() {
       replaceRange: operation(replaceRange),
       getRange: function(from, to) {return getRange(clipPos(from), clipPos(to));},
 
+      triggerOnKeyDown: operation(onKeyDown),
       execCommand: function(cmd) {return commands[cmd](instance);},
       // Stuff used by commands, probably not much use to outside code.
       moveH: operation(moveH),
@@ -373,7 +389,7 @@ var CodeMirror = (function() {
           !posLess(start, sel.from) && !posLess(sel.to, start)) {
         // Let the drag handler handle this.
         if (webkit) lineSpace.draggable = true;
-        var up = connect(targetDocument, "mouseup", operation(function(e2) {
+        var up = connect(document, "mouseup", operation(function(e2) {
           if (webkit) lineSpace.draggable = false;
           draggingText = false;
           up();
@@ -384,6 +400,8 @@ var CodeMirror = (function() {
           }
         }), true);
         draggingText = true;
+        // IE's approach to draggable
+        if (lineSpace.dragDrop) lineSpace.dragDrop();
         return;
       }
       e_preventDefault(e);
@@ -402,12 +420,7 @@ var CodeMirror = (function() {
         }
       }
 
-      var move = connect(targetDocument, "mousemove", operation(function(e) {
-        clearTimeout(going);
-        e_preventDefault(e);
-        extend(e);
-      }), true);
-      var up = connect(targetDocument, "mouseup", operation(function(e) {
+      function done(e) {
         clearTimeout(going);
         var cur = posFromMouse(e);
         if (cur) setSelectionUser(start, cur);
@@ -415,7 +428,14 @@ var CodeMirror = (function() {
         focusInput();
         updateInput = true;
         move(); up();
+      }
+      var move = connect(document, "mousemove", operation(function(e) {
+        clearTimeout(going);
+        e_preventDefault(e);
+        if (!ie && !e_button(e)) done(e);
+        else extend(e);
       }), true);
+      var up = connect(document, "mouseup", operation(done), true);
     }
     function onDoubleClick(e) {
       for (var n = e_target(e); n != wrapper; n = n.parentNode)
@@ -464,11 +484,14 @@ var CodeMirror = (function() {
     }
     function onDragStart(e) {
       var txt = getSelection();
-      // Disabled until further notice. Doesn't work on most browsers,
-      // and crashes Safari (issue #332).
-      //htmlEscape(txt);
-      //e.dataTransfer.setDragImage(escapeElement, 0, 0);
       e.dataTransfer.setData("Text", txt);
+      
+      // Use dummy image instead of default browsers image.
+      if (gecko || chrome) {
+        var img = document.createElement('img');
+        img.scr = 'data:image/gif;base64,R0lGODdhAgACAIAAAAAAAP///ywAAAAAAgACAAACAoRRADs='; //1x1 image
+        e.dataTransfer.setDragImage(img, 0, 0);
+      }
     }
 
     function doHandleBinding(bound, dropShift) {
@@ -506,13 +529,19 @@ var CodeMirror = (function() {
       if (e_prop(e, "ctrlKey")) name = "Ctrl-" + name;
       if (e_prop(e, "metaKey")) name = "Cmd-" + name;
 
-      if (e_prop(e, "shiftKey"))
+      if (e_prop(e, "shiftKey")) {
         handled = lookupKey("Shift-" + name, options.extraKeys, options.keyMap,
-                            function(b) {return doHandleBinding(b, true);});
-      if (!handled)
+                            function(b) {return doHandleBinding(b, true);})
+               || lookupKey(name, options.extraKeys, options.keyMap, function(b) {
+                 if (typeof b == "string" && /^go[A-Z]/.test(b)) return doHandleBinding(b);
+               });
+      } else {
         handled = lookupKey(name, options.extraKeys, options.keyMap, doHandleBinding);
-
-      if (handled) e_preventDefault(e);
+      }
+      if (handled) {
+        e_preventDefault(e);
+        if (ie) { e.oldKeyCode = e.keyCode; e.keyCode = 0; }
+      }
       return handled;
     }
     function handleCharBinding(e, ch) {
@@ -545,7 +574,7 @@ var CodeMirror = (function() {
       if (options.onKeyEvent && options.onKeyEvent(instance, addStop(e))) return;
       var keyCode = e_prop(e, "keyCode"), charCode = e_prop(e, "charCode");
       if (window.opera && keyCode == lastStoppedKey) {lastStoppedKey = null; e_preventDefault(e); return;}
-      if (window.opera && !e.which && handleKeyBinding(e)) return;
+      if (((window.opera && !e.which) || khtml) && handleKeyBinding(e)) return;
       var ch = String.fromCharCode(charCode == null ? keyCode : charCode);
       if (options.electricChars && mode.electricChars && options.smartIndent && !options.readOnly) {
         if (mode.electricChars.indexOf(ch) > -1)
@@ -837,11 +866,11 @@ var CodeMirror = (function() {
       return scrollIntoView(x, cursor.y, x, cursor.yBot);
     }
     function scrollIntoView(x1, y1, x2, y2) {
-      var pl = paddingLeft(), pt = paddingTop(), lh = textHeight();
+      var pl = paddingLeft(), pt = paddingTop();
       y1 += pt; y2 += pt; x1 += pl; x2 += pl;
       var screen = scroller.clientHeight, screentop = scroller.scrollTop, scrolled = false, result = true;
-      if (y1 < screentop) {scroller.scrollTop = Math.max(0, y1 - 2*lh); scrolled = true;}
-      else if (y2 > screentop + screen) {scroller.scrollTop = y2 + lh - screen; scrolled = true;}
+      if (y1 < screentop) {scroller.scrollTop = Math.max(0, y1); scrolled = true;}
+      else if (y2 > screentop + screen) {scroller.scrollTop = y2 - screen; scrolled = true;}
 
       var screenw = scroller.clientWidth, screenleft = scroller.scrollLeft;
       var gutterw = options.fixedGutter ? gutter.clientWidth : 0;
@@ -921,7 +950,7 @@ var CodeMirror = (function() {
         throw new Error("BAD PATCH! " + JSON.stringify(intact) + " size=" + (showingTo - showingFrom) +
                         " nodes=" + lineDiv.childNodes.length);
 
-      if (options.lineWrapping) {
+      function checkHeights() {
         maxWidth = scroller.clientWidth;
         var curNode = lineDiv.firstChild, heightChanged = false;
         doc.iter(showingFrom, showingTo, function(line) {
@@ -936,6 +965,11 @@ var CodeMirror = (function() {
         });
         if (heightChanged)
           code.style.height = (doc.height * th + 2 * paddingTop()) + "px";
+        return heightChanged;
+      }
+
+      if (options.lineWrapping) {
+        checkHeights();
       } else {
         if (maxWidth == null) maxWidth = stringWidth(maxLine);
         if (maxWidth > scroller.clientWidth) {
@@ -947,8 +981,12 @@ var CodeMirror = (function() {
           lineSpace.style.width = code.style.width = "";
         }
       }
+
       gutter.style.display = gutterDisplay;
-      if (different || gutterDirty) updateGutter();
+      if (different || gutterDirty) {
+        // If the gutter grew in size, re-check heights. If those changed, re-draw gutter.
+        updateGutter() && options.lineWrapping && checkHeights() && updateGutter();
+      }
       updateSelection();
       if (!suppressCallback && options.onUpdate) options.onUpdate(instance);
       return true;
@@ -996,16 +1034,17 @@ var CodeMirror = (function() {
       }
       // This pass fills in the lines that actually changed.
       var nextIntact = intact.shift(), curNode = lineDiv.firstChild, j = from;
-      var scratch = targetDocument.createElement("div"), newElt;
+      var scratch = document.createElement("div");
       doc.iter(from, to, function(line) {
         if (nextIntact && nextIntact.to == j) nextIntact = intact.shift();
         if (!nextIntact || nextIntact.from > j) {
           if (line.hidden) var html = scratch.innerHTML = "<pre></pre>";
           else {
-            var html = '<pre>' + line.getHTML(makeTab) + '</pre>';
+            var html = '<pre' + (line.className ? ' class="' + line.className + '"' : '') + '>'
+              + line.getHTML(makeTab) + '</pre>';
             // Kludge to make sure the styled element lies behind the selection (by z-index)
-            if (line.className)
-              html = '<div style="position: relative"><pre class="' + line.className +
+            if (line.bgClassName)
+              html = '<div style="position: relative"><pre class="' + line.bgClassName +
               '" style="position: absolute; left: 0; right: 0; top: 0; bottom: 0; z-index: -2">&#160;</pre>' + html + "</div>";
           }
           scratch.innerHTML = html;
@@ -1021,7 +1060,7 @@ var CodeMirror = (function() {
       if (!options.gutter && !options.lineNumbers) return;
       var hText = mover.offsetHeight, hEditor = scroller.clientHeight;
       gutter.style.height = (hText - hEditor < 2 ? hEditor : hText) + "px";
-      var html = [], i = showingFrom;
+      var html = [], i = showingFrom, normalNode;
       doc.iter(showingFrom, Math.max(showingTo, showingFrom + 1), function(line) {
         if (line.hidden) {
           html.push("<pre></pre>");
@@ -1035,17 +1074,24 @@ var CodeMirror = (function() {
           html.push((marker && marker.style ? '<pre class="' + marker.style + '">' : "<pre>"), text);
           for (var j = 1; j < line.height; ++j) html.push("<br/>&#160;");
           html.push("</pre>");
+          if (!marker) normalNode = i;
         }
         ++i;
       });
       gutter.style.display = "none";
       gutterText.innerHTML = html.join("");
-      var minwidth = String(doc.size).length, firstNode = gutterText.firstChild, val = eltText(firstNode), pad = "";
-      while (val.length + pad.length < minwidth) pad += "\u00a0";
-      if (pad) firstNode.insertBefore(targetDocument.createTextNode(pad), firstNode.firstChild);
+      // Make sure scrolling doesn't cause number gutter size to pop
+      if (normalNode != null) {
+        var node = gutterText.childNodes[normalNode - showingFrom];
+        var minwidth = String(doc.size).length, val = eltText(node), pad = "";
+        while (val.length + pad.length < minwidth) pad += "\u00a0";
+        if (pad) node.insertBefore(document.createTextNode(pad), node.firstChild);
+      }
       gutter.style.display = "";
+      var resized = Math.abs((parseInt(lineSpace.style.marginLeft) || 0) - gutter.offsetWidth) > 2;
       lineSpace.style.marginLeft = gutter.offsetWidth + "px";
       gutterDirty = false;
+      return resized;
     }
     function updateSelection() {
       var collapsed = posEq(sel.from, sel.to);
@@ -1066,16 +1112,18 @@ var CodeMirror = (function() {
           html += '<div class="CodeMirror-selected" style="position: absolute; left: ' + left +
             'px; top: ' + top + 'px; right: ' + right + 'px; height: ' + height + 'px"></div>';
         }
+        var clientWidth = lineSpace.clientWidth || lineSpace.offsetWidth;
+        var clientHeight = lineSpace.clientHeight || lineSpace.offsetHeight;
         if (sel.from.ch && fromPos.y >= 0) {
-          var right = sameLine ? lineSpace.clientWidth - toPos.x : 0;
+          var right = sameLine ? clientWidth - toPos.x : 0;
           add(fromPos.x, fromPos.y, right, th);
         }
         var middleStart = Math.max(0, fromPos.y + (sel.from.ch ? th : 0));
-        var middleHeight = Math.min(toPos.y, lineSpace.clientHeight) - middleStart;
+        var middleHeight = Math.min(toPos.y, clientHeight) - middleStart;
         if (middleHeight > 0.2 * th)
           add(0, middleStart, 0, middleHeight);
-        if ((!sameLine || !sel.from.ch) && toPos.y < lineSpace.clientHeight - .5 * th)
-          add(0, toPos.y, lineSpace.clientWidth - toPos.x, th);
+        if ((!sameLine || !sel.from.ch) && toPos.y < clientHeight - .5 * th)
+          add(0, toPos.y, clientWidth - toPos.x, th);
         selectionDiv.innerHTML = html;
         cursor.style.display = "none";
         selectionDiv.style.display = "";
@@ -1105,7 +1153,12 @@ var CodeMirror = (function() {
       if (posLess(to, from)) {var tmp = to; to = from; from = tmp;}
 
       // Skip over hidden lines.
-      if (from.line != oldFrom) from = skipHidden(from, oldFrom, sel.from.ch);
+      if (from.line != oldFrom) {
+        var from1 = skipHidden(from, oldFrom, sel.from.ch);
+        // If there is no non-hidden line left, force visibility on current line
+        if (!from1) setLineHidden(from.line, false);
+        else from = from1;
+      }
       if (to.line != oldTo) to = skipHidden(to, oldTo, sel.to.ch);
 
       if (posEq(from, to)) sel.inverted = false;
@@ -1114,7 +1167,7 @@ var CodeMirror = (function() {
 
       if (options.autoClearEmptyLines && posEq(sel.from, sel.to)) {
         var head = sel.inverted ? from : to;
-        if (head.line != sel.from.line) {
+        if (head.line != sel.from.line && sel.from.line < doc.size) {
           var oldLine = getLine(sel.from.line);
           if (/^\s+$/.test(oldLine.text))
             setTimeout(operation(function() {
@@ -1209,6 +1262,7 @@ var CodeMirror = (function() {
       if (unit == "page") dist = Math.min(scroller.clientHeight, window.innerHeight || document.documentElement.clientHeight);
       else if (unit == "line") dist = textHeight();
       var target = coordsChar(pos.x, pos.y + dist * dir + 2);
+      if (unit == "page") scroller.scrollTop += localCoords(target, true).y - pos.y;
       setCursor(target.line, target.ch, true);
       goalColumn = pos.x;
     }
@@ -1295,9 +1349,10 @@ var CodeMirror = (function() {
       changes.push({from: 0, to: doc.size});
     }
     function makeTab(col) {
-      var w = options.tabSize - col % options.tabSize;
+      var w = options.tabSize - col % options.tabSize, cached = tabCache[w];
+      if (cached) return cached;
       for (var str = '<span class="cm-tab">', i = 0; i < w; ++i) str += " ";
-      return {html: str + "</span>", width: w};
+      return (tabCache[w] = {html: str + "</span>", width: w});
     }
     function themeChanged() {
       scroller.className = scroller.className.replace(/\s*cm-s-\w+/g, "") +
@@ -1313,7 +1368,7 @@ var CodeMirror = (function() {
         var lineN = lineNo(line);
         min = Math.min(min, lineN); max = Math.max(max, lineN);
         for (var j = 0; j < mk.length; ++j)
-          if (mk[j].set == this.set) mk.splice(j--, 1);
+          if (mk[j].marker == this) mk.splice(j--, 1);
       }
       if (min != Infinity)
         changes.push({from: min, to: max + 1});
@@ -1324,7 +1379,7 @@ var CodeMirror = (function() {
         var line = this.set[i], mk = line.marked;
         for (var j = 0; j < mk.length; ++j) {
           var mark = mk[j];
-          if (mark.set == this.set) {
+          if (mark.marker == this) {
             if (mark.from != null || mark.to != null) {
               var found = lineNo(line);
               if (found != null) {
@@ -1341,8 +1396,9 @@ var CodeMirror = (function() {
     function markText(from, to, className) {
       from = clipPos(from); to = clipPos(to);
       var tm = new TextMarker();
+      if (!posLess(from, to)) return tm;
       function add(line, from, to, className) {
-        getLine(line).addMark(new MarkedText(from, to, className, tm.set));
+        getLine(line).addMark(new MarkedText(from, to, className, tm));
       }
       if (from.line == to.line) add(from.line, from.ch, to.ch, className);
       else {
@@ -1362,6 +1418,19 @@ var CodeMirror = (function() {
       return bm;
     }
 
+    function findMarksAt(pos) {
+      pos = clipPos(pos);
+      var markers = [], marked = getLine(pos.line).marked;
+      if (!marked) return markers;
+      for (var i = 0, e = marked.length; i < e; ++i) {
+        var m = marked[i];
+        if ((m.from == null || m.from <= pos.ch) &&
+            (m.to == null || m.to >= pos.ch))
+          markers.push(m.marker || m);
+      }
+      return markers;
+    }
+
     function addGutterMarker(line, text, className) {
       if (typeof line == "number") line = getLine(clipLine(line));
       line.gutterMarker = {text: text, style: className};
@@ -1383,10 +1452,11 @@ var CodeMirror = (function() {
       else return null;
       return line;
     }
-    function setLineClass(handle, className) {
+    function setLineClass(handle, className, bgClassName) {
       return changeLine(handle, function(line) {
-        if (line.className != className) {
+        if (line.className != className || line.bgClassName != bgClassName) {
           line.className = className;
+          line.bgClassName = bgClassName;
           return true;
         }
       });
@@ -1400,6 +1470,8 @@ var CodeMirror = (function() {
           if (hidden && (fline == no || tline == no)) {
             var from = fline == no ? skipHidden({line: fline, ch: 0}, fline, 0) : sel.from;
             var to = tline == no ? skipHidden({line: tline, ch: 0}, tline, 0) : sel.to;
+            // Can't hide the last visible line, we'd have no place to put the cursor
+            if (!to) return;
             setSelection(from, to);
           }
           return (gutterDirty = true);
@@ -1420,7 +1492,7 @@ var CodeMirror = (function() {
       }
       var marker = line.gutterMarker;
       return {line: n, handle: line, text: line.text, markerText: marker && marker.text,
-              markerClass: marker && marker.style, lineClass: line.className};
+              markerClass: marker && marker.style, lineClass: line.className, bgClass: line.bgClassName};
     }
 
     function stringWidth(str) {
@@ -1464,7 +1536,7 @@ var CodeMirror = (function() {
       var extra = "";
       // Include extra text at the end to make sure the measured line is wrapped in the right way.
       if (options.lineWrapping) {
-        var end = line.text.indexOf(" ", ch + 2);
+        var end = line.text.indexOf(" ", ch + 6);
         extra = htmlEscape(line.text.slice(ch + 1, end < 0 ? line.text.length : end + (ie ? 5 : 0)));
       }
       measure.innerHTML = "<pre>" + line.getHTML(makeTab, ch) +
@@ -1823,7 +1895,7 @@ var CodeMirror = (function() {
     pollInterval: 100,
     undoDepth: 40,
     tabindex: null,
-    document: window.document
+    autofocus: null
   };
 
   var ios = /AppleWebKit/.test(navigator.userAgent) && /Mobile\/\w+/.test(navigator.userAgent);
@@ -1831,7 +1903,7 @@ var CodeMirror = (function() {
   var win = /Win/.test(navigator.platform);
 
   // Known modes, by name and by MIME
-  var modes = {}, mimeModes = {};
+  var modes = CodeMirror.modes = {}, mimeModes = CodeMirror.mimeModes = {};
   CodeMirror.defineMode = function(name, mode) {
     if (!CodeMirror.defaults.mode && name != "null") CodeMirror.defaults.mode = name;
     modes[name] = mode;
@@ -1842,6 +1914,8 @@ var CodeMirror = (function() {
   CodeMirror.resolveMode = function(spec) {
     if (typeof spec == "string" && mimeModes.hasOwnProperty(spec))
       spec = mimeModes[spec];
+    else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+xml$/.test(spec))
+      return CodeMirror.resolveMode("application/xml");
     if (typeof spec == "string") return {name: spec};
     else return spec || {name: "null"};
   };
@@ -1926,7 +2000,7 @@ var CodeMirror = (function() {
   keyMap.basic = {
     "Left": "goCharLeft", "Right": "goCharRight", "Up": "goLineUp", "Down": "goLineDown",
     "End": "goLineEnd", "Home": "goLineStartSmart", "PageUp": "goPageUp", "PageDown": "goPageDown",
-    "Delete": "delCharRight", "Backspace": "delCharLeft", "Tab": "indentMore", "Shift-Tab": "indentLess",
+    "Delete": "delCharRight", "Backspace": "delCharLeft", "Tab": "insertTab", "Shift-Tab": "indentAuto",
     "Enter": "newlineAndIndent", "Insert": "toggleOverwrite"
   };
   // Note that the save and find-related commands aren't defined by
@@ -1937,6 +2011,7 @@ var CodeMirror = (function() {
     "Ctrl-Left": "goWordLeft", "Ctrl-Right": "goWordRight", "Alt-Left": "goLineStart", "Alt-Right": "goLineEnd",
     "Ctrl-Backspace": "delWordLeft", "Ctrl-Delete": "delWordRight", "Ctrl-S": "save", "Ctrl-F": "find",
     "Ctrl-G": "findNext", "Shift-Ctrl-G": "findPrev", "Shift-Ctrl-F": "replace", "Shift-Ctrl-R": "replaceAll",
+    "Ctrl-[": "indentLess", "Ctrl-]": "indentMore",
     fallthrough: "basic"
   };
   keyMap.macDefault = {
@@ -1945,6 +2020,7 @@ var CodeMirror = (function() {
     "Alt-Right": "goWordRight", "Cmd-Left": "goLineStart", "Cmd-Right": "goLineEnd", "Alt-Backspace": "delWordLeft",
     "Ctrl-Alt-Backspace": "delWordRight", "Alt-Delete": "delWordRight", "Cmd-S": "save", "Cmd-F": "find",
     "Cmd-G": "findNext", "Shift-Cmd-G": "findPrev", "Cmd-Alt-F": "replace", "Shift-Cmd-Alt-F": "replaceAll",
+    "Cmd-[": "indentLess", "Cmd-]": "indentMore",
     fallthrough: ["basic", "emacsy"]
   };
   keyMap["default"] = mac ? keyMap.macDefault : keyMap.pcDefault;
@@ -1987,6 +2063,8 @@ var CodeMirror = (function() {
     options.value = textarea.value;
     if (!options.tabindex && textarea.tabindex)
       options.tabindex = textarea.tabindex;
+    if (options.autofocus == null && textarea.getAttribute("autofocus") != null)
+      options.autofocus = true;
 
     function save() {textarea.value = instance.getValue();}
     if (textarea.form) {
@@ -2098,34 +2176,34 @@ var CodeMirror = (function() {
   };
   CodeMirror.StringStream = StringStream;
 
-  function MarkedText(from, to, className, set) {
-    this.from = from; this.to = to; this.style = className; this.set = set;
+  function MarkedText(from, to, className, marker) {
+    this.from = from; this.to = to; this.style = className; this.marker = marker;
   }
   MarkedText.prototype = {
-    attach: function(line) { this.set.push(line); },
+    attach: function(line) { this.marker.set.push(line); },
     detach: function(line) {
-      var ix = indexOf(this.set, line);
-      if (ix > -1) this.set.splice(ix, 1);
+      var ix = indexOf(this.marker.set, line);
+      if (ix > -1) this.marker.set.splice(ix, 1);
     },
     split: function(pos, lenBefore) {
       if (this.to <= pos && this.to != null) return null;
       var from = this.from < pos || this.from == null ? null : this.from - pos + lenBefore;
       var to = this.to == null ? null : this.to - pos + lenBefore;
-      return new MarkedText(from, to, this.style, this.set);
+      return new MarkedText(from, to, this.style, this.marker);
     },
-    dup: function() { return new MarkedText(null, null, this.style, this.set); },
+    dup: function() { return new MarkedText(null, null, this.style, this.marker); },
     clipTo: function(fromOpen, from, toOpen, to, diff) {
-      if (this.from != null && this.from >= from)
-        this.from = Math.max(to, this.from) + diff;
-      if (this.to != null && this.to > from)
-        this.to = to < this.to ? this.to + diff : from;
       if (fromOpen && to > this.from && (to < this.to || this.to == null))
         this.from = null;
+      else if (this.from != null && this.from >= from)
+        this.from = Math.max(to, this.from) + diff;
       if (toOpen && (from < this.to || this.to == null) && (from > this.from || this.from == null))
         this.to = null;
+      else if (this.to != null && this.to > from)
+        this.to = to < this.to ? this.to + diff : from;
     },
     isDead: function() { return this.from != null && this.to != null && this.from >= this.to; },
-    sameSet: function(x) { return this.set == x.set; }
+    sameSet: function(x) { return this.marker == x.marker; }
   };
 
   function Bookmark(pos) {
@@ -2168,7 +2246,7 @@ var CodeMirror = (function() {
     this.styles = styles || [text, null];
     this.text = text;
     this.height = 1;
-    this.marked = this.gutterMarker = this.className = this.handlers = null;
+    this.marked = this.gutterMarker = this.className = this.bgClassName = this.handlers = null;
     this.stateAfter = this.parent = this.hidden = null;
   }
   Line.inheritMarks = function(text, orig) {
@@ -2214,6 +2292,7 @@ var CodeMirror = (function() {
           if (newmark) {
             if (!taken.marked) taken.marked = [];
             taken.marked.push(newmark); newmark.attach(taken);
+            if (newmark == mark) mk.splice(i--, 1);
           }
         }
       }
@@ -2637,10 +2716,10 @@ var CodeMirror = (function() {
         if (start < last.start) {
           for (var i = last.start - start - 1; i >= 0; --i)
             last.old.unshift(old[i]);
-          last.added += last.start - start;
+          oldoff = Math.min(0, added - old.length);
+          last.added += last.start - start + oldoff;
           last.start = start;
-        }
-        else if (last.start < start) {
+        } else if (last.start < start) {
           oldoff = start - last.start;
           added += oldoff;
         }
@@ -2707,19 +2786,21 @@ var CodeMirror = (function() {
 
   var Pass = CodeMirror.Pass = {toString: function(){return "CodeMirror.Pass";}};
 
-  // Detect drag-and-drop
-  var dragAndDrop = function() {
-    // IE8 has ondragstart and ondrop properties, but doesn't seem to
-    // actually support ondragstart the way it's supposed to work.
-    if (/MSIE [1-8]\b/.test(navigator.userAgent)) return false;
-    var div = document.createElement('div');
-    return "draggable" in div;
-  }();
-
   var gecko = /gecko\/\d{7}/i.test(navigator.userAgent);
   var ie = /MSIE \d/.test(navigator.userAgent);
   var ie_lt9 = /MSIE [1-8]\b/.test(navigator.userAgent);
   var webkit = /WebKit\//.test(navigator.userAgent);
+  var chrome = /Chrome\//.test(navigator.userAgent);
+  var khtml = /KHTML\//.test(navigator.userAgent);
+
+  // Detect drag-and-drop
+  var dragAndDrop = function() {
+    // There is *some* kind of drag-and-drop support in IE6-8, but I
+    // couldn't get it to work yet.
+    if (ie_lt9) return false;
+    var div = document.createElement('div');
+    return "draggable" in div || "dragDrop" in div;
+  }();
 
   var lineSep = "\n";
   // Feature-detect whether newlines in textareas are converted to \r\n
@@ -2873,7 +2954,7 @@ var CodeMirror = (function() {
   var keyNames = {3: "Enter", 8: "Backspace", 9: "Tab", 13: "Enter", 16: "Shift", 17: "Ctrl", 18: "Alt",
                   19: "Pause", 20: "CapsLock", 27: "Esc", 32: "Space", 33: "PageUp", 34: "PageDown", 35: "End",
                   36: "Home", 37: "Left", 38: "Up", 39: "Right", 40: "Down", 44: "PrintScrn", 45: "Insert",
-                  46: "Delete", 59: ";", 91: "Mod", 92: "Mod", 93: "Mod", 186: ";", 187: "=", 188: ",",
+                  46: "Delete", 59: ";", 91: "Mod", 92: "Mod", 93: "Mod", 127: "Delete", 186: ";", 187: "=", 188: ",",
                   189: "-", 190: ".", 191: "/", 192: "`", 219: "[", 220: "\\", 221: "]", 222: "'", 63276: "PageUp",
                   63277: "PageDown", 63275: "End", 63273: "Home", 63234: "Left", 63232: "Up", 63235: "Right",
                   63233: "Down", 63302: "Insert", 63272: "Delete"};
diff --git a/assets/codemirror/javascript.js b/assets/codemirror/javascript.js
index b9388bc..462f486 100644
--- a/assets/codemirror/javascript.js
+++ b/assets/codemirror/javascript.js
@@ -319,8 +319,8 @@ CodeMirror.defineMode("javascript", function(config, parserConfig) {
         kwAllowed: true,
         cc: [],
         lexical: new JSLexical((basecolumn || 0) - indentUnit, 0, "block", false),
-        localVars: null,
-        context: null,
+        localVars: parserConfig.localVars,
+        context: parserConfig.localVars && {vars: parserConfig.localVars},
         indented: 0
       };
     },
@@ -334,7 +334,7 @@ CodeMirror.defineMode("javascript", function(config, parserConfig) {
       if (stream.eatSpace()) return null;
       var style = state.tokenize(stream, state);
       if (type == "comment") return style;
-      state.reAllowed = type == "operator" || type == "keyword c" || type.match(/^[\[{}\(,;:]$/);
+      state.reAllowed = !!(type == "operator" || type == "keyword c" || type.match(/^[\[{}\(,;:]$/));
       state.kwAllowed = type != '.';
       return parseJS(state, style, type, content, stream);
     },