anchor.diff:    //dom.MutationObserver _mObserver;
   
     bool _isDragActive = false;
  +  bool _isDragStartPending = false;
     math.Point<int> _dragStartPos;
     int _minLeft;
     int _maxLeft;
  
positive.code:           _dragEnd(e);
          }
        }
      });
    }
  
  
negative.code:       _mouseMoveSubscr = null;
      }
      _isDragActive = false;
      _isDragStartPending = false;
      _dragStartPos = null;
      if(_draggedHelper != null) {
        _draggedHelper.remove();
  