Take care to not modify deltas in place when composing in undo-manager,

fixes slab#296
voxmedia · Jun 2, 2015 · d32cc16 · d32cc16
1 parent 545eedc
commit d32cc16
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/src/modules/undo-manager.coffee b/src/modules/undo-manager.coffee
@@ -51,8 +51,8 @@ class UndoManager
       timestamp = new Date().getTime()
       if @lastRecorded + @options.delay > timestamp and @stack.undo.length > 0
         change = @stack.undo.pop()
-        undoDelta = undoDelta.compose(change.undo)
-        changeDelta = change.redo.compose(changeDelta)
+        undoDelta = new Delta().compose(undoDelta).compose(change.undo)
+        changeDelta = new Delta().compose(change.redo).compose(changeDelta)
       else
         @lastRecorded = timestamp
       @stack.undo.push({