diff --git a/lib/ace/range.js b/lib/ace/range.js
index 8f22285d..23f7b236 100644
--- a/lib/ace/range.js
+++ b/lib/ace/range.js
@@ -115,6 +115,26 @@ var Range = function(startRow, startColumn, endRow, endColumn) {
         return this.start.row == row && this.start.column == column;
     }
 
+    this.setStart = function(row, column) {
+        if (typeof row == "object") {
+            this.start.column = row.column;
+            this.start.row = row.row;
+        } else {
+            this.start.row = row;
+            this.start.column = column;
+        }
+    }
+
+    this.setEnd = function(row, column) {
+        if (typeof row == "object") {
+            this.end.column = row.column;
+            this.end.row = row.row;
+        } else {
+            this.end.row = row;
+            this.end.column = column;
+        }
+    }
+
     this.inside = function(row, column) {
         if (this.compare(row, column) == 0) {
             if (this.isEnd(row, column) || this.isStart(row, column)) {
diff --git a/lib/ace/undomanager.js b/lib/ace/undomanager.js
index 5cb8e78b..66debe14 100644
--- a/lib/ace/undomanager.js
+++ b/lib/ace/undomanager.js
@@ -49,6 +49,7 @@ var UndoManager = function() {
         var deltas = options.args[0];
         this.$doc  = options.args[1];
         this.$undoStack.push(deltas);
+        this.$redoStack = [];
     };
 
     this.undo = function() {