Fixed timeline not being redrawn after cancelled update event

HISTORY.md

@@ -12,6 +12,8 @@ http://visjs.org
   - Improved layout of box-items inside groups.
 - Fixed option `autoResize` forcing a repaint of the Timeline with every check
   rather than when the Timeline is actually resized.
+- Fixed `select` event fired repeatedly when clicking an empty place on the
+  Timeline, deselecting selected items).
 - Minor bug fixes.
 - More examples added.
 

src/timeline/component/ItemSet.js

@@ -705,8 +705,8 @@ ItemSet.prototype._onDragEnd = function (event) {
             if ('start' in props) props.item.data.start = props.start;
             if ('end' in props)   props.item.data.end   = props.end;
 
-            this.stackDirty = true; // force re-stacking of all items next repaint
-            this.emit('change');
+            me.stackDirty = true; // force re-stacking of all items next repaint
+            me.emit('change');
           }
         });
       }