anchor.diff:  }
   
   class NetworkImage extends Component {
  -  NetworkImage({ String src, this.size }) : src = src, super(key: src);
  +  NetworkImage({ String src, this.size })
  +    : src = src,
  +      super(key: src);
   
     final String src;
     final Size size;
  
positive.code:   ColorFilter({ String key, this.color, this.transferMode, Widget child })
      : super(key: key, child: child);
  
    RenderColorFilter get root => super.root;
    final Color color;
    final sky.TransferMode transferMode;
  
    RenderColorFilter createNode() => new RenderColorFilter(color: color, transferMode: transferMode);
  
    void syncRenderObject(ColorFilter old) {
      super.syncRenderObject(old);
  
negative.code:   void remove() {
      RenderObjectWrapper ancestor = findAncestorRenderObjectWrapper();
      assert(ancestor is RenderObjectWrapper);
      assert(ancestor.root == root.parent);
      ancestor.detachChildRoot(this);
      super.remove();
    }
  }
  