Ticket #3662: 3662.patch

_source/plugins/undo/plugin.js

@@ -46 +46 @@
                                         canUndo : false
                                 });
 
+                        editor.on( 'resetUndoHistory', function()
+                                {
+                                        // Reset the undo stack.
+                                        undoManager.reset();
+
+                                        // Create the first image.
+                                        editor.fire( 'saveSnapshot' );
+                                });
+
                         undoManager.onChange = function()
                         {
                                 undoCommand.setState( undoManager.undoable() ? CKEDITOR.TRISTATE_OFF : CKEDITOR.TRISTATE_DISABLED );
@@ -166 +175 @@
          */
         function UndoManager( editor )
         {
-                this.typesCount = 0;
-
                 this.editor = editor;
 
-                /**
-                 * Stack for all the undo and redo snapshots, they're always created/removed
-                 * in consistency.
-                 */
-                this.snapshots = [];
-
-                /**
-                 * Current snapshot history index.
-                 */
-                this.index = -1;
-
-                this.limit = editor.config.undoStackSize;
+                this.reset();
         }
 
         UndoManager.prototype =
@@ -278 +274 @@
                         return true;
                 },
 
+                reset : function()      // Reset the undo stack,
+                {
+                        this.typesCount = 0;
+
+                        /**
+                         * Stack for all the undo and redo snapshots, they're always created/removed
+                         * in consistency.
+                         */
+                        this.snapshots = [];
+
+                        /**
+                         * Current snapshot history index.
+                         */
+                        this.index = -1;
+
+                        this.limit = this.editor.config.undoStackSize;
+
+                        this.currentImage = null;
+                },
+
                 restoreImage : function( image )
                 {
                         this.editor.loadSnapshot( image.contents );