anchor.diff:          _rowIndexesToNodeUIDs(rowIndexes),
           event);
     }
  -  
  +
     bool listViewKeyDown(KeyboardEvent event) {
       int keyCode = event.which;
       bool expand;
  -    
  +
       switch (keyCode) {
         case KeyCode.RIGHT:
           expand = true;
  
positive.code:         _rows[rowIndex].nodeUID,
          event);
    }
    
    String listViewDropEffect(ListView view, MouseEvent event) {
      String nodeUID = null;
      if (_currentDragOverCell != null) {
  
negative.code:       default:
          return true;
      }
  
      for(String nodeUID in selection) {
        if (_rowsMap.containsKey(nodeUID)) {
          setNodeExpanded(nodeUID, expand);
        }
      }
  
      if (!expand) {
        _cleanSelection();
      }
  