anchor.diff:          _rows[rowIndex].nodeUID,
           event);
     }
  -  
  +
     String listViewDropEffect(ListView view, MouseEvent event) {
       String nodeUID = null;
       if (_currentDragOverCell != null) {
  
positive.code:         _rowIndexesToNodeUIDs(rowIndexes),
          event);
    }
    
    bool listViewKeyDown(KeyboardEvent event) {
      int keyCode = event.which;
      bool expand;
      
      switch (keyCode) {
        case KeyCode.RIGHT:
          expand = true;
  
negative.code:       }
      }
    }
  
    /**
     * Cleans the selection to not include non-showing elements
     */
  