anchor.diff:  
   class Label extends Skinnable {
   
  +  Layout _layout;
     String _description;
     String _text;
     HorizontalAlign _hAlign;
  
positive.code:         addChild(content);
        }
      }
    }
  
    @override
  
negative.code:         var w = width;
          if (w == 0) {
            t.x = d.x + d.width + gap;
          } else {
            t.x = (width - gap * 2 - t.width);
          }
  