anchor.diff:    @observable bool isStackingHistory = false;
   
     Timer zippedJsonUpdater;
  +  Function afterRendered;
   
     PixelCanvasElement get canvas => shadowRoot.querySelector('pixel-canvas');
     AnsiColorPaletteElement get _palette =>
  
positive.code:     _loadPixels(j['pixels']);
  
      if (!updateZippedJson)
        new Timer(new Duration(milliseconds: 800), () => _clearZippedJsonUpdater());
    }
  
    void _loadPixels(List<List<int>> pixels) {
  
negative.code:   @override
    attached() {
      super.attached();
      _initCallbacks();
      _asyncUpdateContainterSize();
      _startUrlFragmentObsevation();
      async((_) { _updateZipped();});
      _initLocalStorageProps();
    }
  