anchor.diff:      });
     });
   
  -  var panZoom = new panzoom.SvgPanZoom.selector('.inner-svg');
  +  panZoom = new panzoom.SvgPanZoom.selector('.inner-svg');
     panZoom
       ..zoomEnabled = true
       ..panEnabled = true
  
positive.code:   group.nodes.insert(0, rect);
  
    // Adjust the viewport on the parent svg element.
    innerSvg.viewport.width = (maxX - minX).toInt();
    innerSvg.viewport.height = (maxY - minY).toInt();
  }
  
  Future prettyString(Map map) async {
  
negative.code: }
  
  void displayData(List data) {
    // Before doing anything else, reset the viewport of the visualisation.
    resetVisualisation();
    svg.SvgSvgElement innerSvg = querySelector('.inner-svg');
    svg.GElement group = innerSvg.querySelector('#viewport');
    group.nodes.clear();
  