anchor.diff:        // Adds an arrow in front the cell.
         _arrow = new DivElement();
         _arrow.classes.add('treeviewcell-disclosure');
  -      _arrow.style.left = margin.toString() + 'px';
  +      _arrow.style.left = '${margin}px';
         _arrow.appendHtml('&#9654;');
         _applyExpanded(_row.expanded);
         _element.children.add(_arrow);
  
positive.code:     _embeddedCellContainer = new DivElement();
      int margin = (_row.level * 10);
      _embeddedCellContainer.classes.add('treeviewcell-content');
      _embeddedCellContainer.style.left = (margin + 20).toString() + 'px';
      int offsetX = margin + 30;
      _embeddedCellContainer.style.width = 'calc(100% - ${offsetX}px)';
      _embeddedCellContainer.children.add(_embeddedCell.element);
  
negative.code: 
      _dragOverlay = new DivElement();
      _dragOverlay.classes.add('treeviewcell-dragoverlay');
      _dragOverlay.style.left = '${margin + 15}px';
      offsetX = margin + 20;
      _dragOverlay.style.width = 'calc(100% - ${offsetX}px)';
      _element.children.add(_dragOverlay);
  