diff --git a/lib/ace/apply_delta.js b/lib/ace/apply_delta.js
index 3d40d614..1317ce98 100644
--- a/lib/ace/apply_delta.js
+++ b/lib/ace/apply_delta.js
@@ -86,10 +86,11 @@ function validateDelta(docLines, delta) {
         throwDeltaError(delta, 'delta.range must match delta lines');
 }
 
-exports.applyDelta = function(docLines, delta) {
+exports.applyDelta = function(docLines, delta, doNotValidate) {
             
     // Validate delta.
-    validateDelta(docLines, delta);
+    if (!doNotValidate)
+        validateDelta(docLines, delta);
     
     // Apply delta.
     if (delta.range.start.row == delta.range.end.row)
diff --git a/lib/ace/document.js b/lib/ace/document.js
index cefaa136..c4f8a9eb 100644
--- a/lib/ace/document.js
+++ b/lib/ace/document.js
@@ -322,7 +322,7 @@ var Document = function(textOrLines) {
             action: "insert",
             range: Range.fromPoints(position, endPoint),
             lines: [text]
-        });
+        }, true /*doNotValidate*/);
         
         return endPoint;
     };
@@ -449,8 +449,8 @@ var Document = function(textOrLines) {
         this.applyDelta({
             action: 'remove',
             range: range,
-            lines: this.getLinesForRange(range)
-        });
+            lines: this.getLinesForRange(range),
+        }, true /*doNotValidate*/);
         
         return range.start;
     };
@@ -567,7 +567,7 @@ var Document = function(textOrLines) {
     * Applies `delta` to the document.
     * @param {Object} delta A delta object (can include 'insert' and 'remove' actions)
     **/
-    this.applyDelta = function(delta) {
+    this.applyDelta = function(delta, doNotValidate) {
 
         // Split large insert deltas. This is necessary because:
         //    1. We need to support splicing delta lines into the document via $lines.splice.apply(...)
@@ -596,8 +596,8 @@ var Document = function(textOrLines) {
         }
         
         // Apply.
-        applyDelta(this.$lines, delta);
-        this._emit("change", { data: delta });            
+        applyDelta(this.$lines, delta, doNotValidate);
+        this._emit("change", { data: delta });      
     };
     
     /**
diff --git a/lib/ace/edit_session.js b/lib/ace/edit_session.js
index 7312f23b..414b68c1 100644
--- a/lib/ace/edit_session.js
+++ b/lib/ace/edit_session.js
@@ -1384,7 +1384,7 @@ var EditSession = function(text, mode) {
     this.indentRows = function(startRow, endRow, indentString) {
         indentString = indentString.replace(/\t/g, this.getTabString());
         for (var row=startRow; row<=endRow; row++)
-            this.insert({row: row, column:0}, indentString);
+            this.doc.insertInLine({row: row, column: 0}, indentString);
     };
 
     /**
@@ -1395,25 +1395,25 @@ var EditSession = function(text, mode) {
     **/
     this.outdentRows = function (range) {
         var rowRange = range.collapseRows();
-        var deleteRange = new Range(0, 0, 0, 0);
         var size = this.getTabSize();
-
+        
         for (var i = rowRange.start.row; i <= rowRange.end.row; ++i) {
             var line = this.getLine(i);
-
-            deleteRange.start.row = i;
-            deleteRange.end.row = i;
+            var row = i;
+            var startCol = 0;
+            var endCol = 0;
+            
             for (var j = 0; j < size; ++j)
                 if (line.charAt(j) != ' ')
                     break;
             if (j < size && line.charAt(j) == '\t') {
-                deleteRange.start.column = j;
-                deleteRange.end.column = j + 1;
+                startCol = j;
+                endCol = j + 1;
             } else {
-                deleteRange.start.column = 0;
-                deleteRange.end.column = j;
+                startCol = 0;
+                endCol = j;
             }
-            this.remove(deleteRange);
+            this.doc.removeInLine(row, startCol, endCol);
         }
     };