diff --git a/lib/ace/apply_delta.js b/lib/ace/apply_delta.js
index 3996920c..ed019ccb 100644
--- a/lib/ace/apply_delta.js
+++ b/lib/ace/apply_delta.js
@@ -31,19 +31,6 @@
 define(function(require, exports, module) {
 "use strict";
 
-var Range = require("./range").Range;
-
-function splitLine (docLines, position) {
-    var text = docLines[position.row];
-    docLines[position.row] = text.slice(0, position.column);
-    docLines.splice(position.row + 1, 0, text.slice(position.column));
-}
-
-function joinLineWithNext(docLines, row) {
-    docLines[row] += docLines[row + 1];
-    docLines.splice(row + 1, 1);
-}
-
 function throwDeltaError(delta, errorText){
     console.log("Invalid Delta:", delta);
     throw "Invalid Delta: " + errorText;
@@ -91,44 +78,40 @@ exports.applyDelta = function(docLines, delta, doNotValidate) {
     if (!doNotValidate)
         validateDelta(docLines, delta);
     
+    var row = delta.start.row;
+    var startColumn = delta.start.column;
+    var line = docLines[row];
     // Apply delta.
-    if (delta.start.row == delta.end.row) {
+    if (row == delta.end.row) {
         // Apply single-line delta.
         // Note: The multi-line code below correctly handle single-line
         //       deltas too, but we need to short-circuit for speed.
-        var row         = delta.start.row;
-        var startColumn = delta.start.column;
-        var endColumn   = delta.end.column;
-        var line        = docLines[row];
+        var endColumn = delta.end.column;
         switch (delta.action) {
-            
             case "insert":
                 docLines[row] = line.substring(0, startColumn) + delta.lines[0] + line.substring(startColumn);
                 break;
-            
             case "remove":
                 docLines[row] = line.substring(0, startColumn) + line.substring(endColumn);
                 break;
         }
     } else {
-        
         // Apply multi-line delta.
         switch (delta.action) {
             case "insert":
-                splitLine(docLines, delta.start);
-                docLines.splice.apply(docLines, [delta.start.row + 1, 0].concat(delta.lines));
-                joinLineWithNext(docLines, delta.start.row);
-                joinLineWithNext(docLines, delta.end.row);
+                var line = docLines[row];
+                var args = [row, 1].concat(delta.lines);
+                docLines.splice.apply(docLines, args);
+                docLines[row] = line.substring(0, startColumn) + docLines[row];
+                docLines[row + delta.lines.length - 1] += line.substring(startColumn);
                 break;
-            
             case "remove":
-                splitLine(docLines, delta.end);
-                splitLine(docLines, delta.start);
+                var endRow
                 docLines.splice(
-                    delta.start.row + 1,                       // Where to start deleting
-                    delta.end.row - delta.start.row + 1  // Num lines to delete.
+                    row,                                 // Where to start deleting
+                    delta.end.row - delta.start.row + 1,  // Num lines to delete.
+                    line.substring(0, startColumn) + docLines[delta.end.row].substring(delta.end.column)
                 );
-                joinLineWithNext(docLines, delta.start.row);
                 break;
         }
     }