diff --git a/lib/ace/document.js b/lib/ace/document.js
index cc72bc63..7b3e6221 100644
--- a/lib/ace/document.js
+++ b/lib/ace/document.js
@@ -571,11 +571,12 @@ var Document = function(textOrLines) {
         var isInsert = delta.action == "insert";
         // An empty range is a NOOP.
         if (isInsert ? delta.lines.length <= 1 && !delta.lines[0]
-            : !Range.comparePoints(delta.start, delta.end))
+            : !Range.comparePoints(delta.start, delta.end)) {
             return;
+        }
         
-        if (isInsert && delta.lines.length > 0xF000)
-            this.$splitAndapplyLargeDelta(delta, 0xF000);
+        if (isInsert && delta.lines.length > 20000)
+            this.$splitAndapplyLargeDelta(delta, 20000);
         
         // Apply.
         applyDelta(this.$lines, delta, doNotValidate);
@@ -585,8 +586,8 @@ var Document = function(textOrLines) {
     this.$splitAndapplyLargeDelta = function(delta, MAX) {
         // Split large insert deltas. This is necessary because:
         //    1. We need to support splicing delta lines into the document via $lines.splice.apply(...)
-        //    2. fn.apply() doesn't work for a large number of params. The smallest threshold is on safari 0xFFFF.
-        // we use 0xF000 to leave some space for actual stack
+        //    2. fn.apply() doesn't work for a large number of params. The smallest threshold is on chrome 40 ~42000.
+        // we use 20000 to leave some space for actual stack
         // 
         // To Do: Ideally we'd be consistent and also split 'delete' deltas. We don't do this now, because delete
         //        delta handling is too slow. If we make delete delta handling faster we can split all large deltas
@@ -623,10 +624,9 @@ var Document = function(textOrLines) {
     * @param {Object} delta A delta object (can include "insert" and "remove" actions)
     **/
     this.revertDelta = function(delta) {
-        var range = Range.fromPoints(delta.start, delta.end); 
         this.applyDelta({
-            start: range.start,
-            end: range.end,
+            start: this.clonePos(delta.start),
+            end: this.clonePos(delta.end),
             action: (delta.action == "insert" ? "remove" : "insert"),
             lines: delta.lines.slice()
         });