anchor.diff:      for (var row in _rowOwners[i].keys) {
         if (row == 0) {
           return 96;
  +      }
  +      if(_nodes == null || _nodes.length == 0) {
  +        return -1;
         }
         var node = _nodes[row - 1];
         if (node.attributes.containsKey('v-flex') || node.attributes.containsKey('flex')) {
  
positive.code:   bool _isLayoutJobStarted = false;  
    int _colCount = 0, _rowCount = 0;
    List<Map<int,int>> _colOwners, _rowOwners;
    List<Element> _nodes;
    Element _lineParent;
    List<Map<String,int>> _rows;
    List<Map<String,int>> _columns;
  
negative.code:   
      _lineParent = alineParent;
      _nodes = anodes;
      if(_nodes == null) {
        _nodes = [];
      }
      matrixillate(matrix);
  
      _nodes.forEach(unposition);
    
      _columns = railize(_colCount, colWidth);
  