anchor.diff:            if (debugPaintSizeEnabled == value)
               return;
             debugPaintSizeEnabled = value;
  -          RenderObjectVisitor visitor;
  -          visitor = (RenderObject child) {
  -            child.markNeedsPaint();
  -            child.visitChildren(visitor);
  -          };
  -          instance?.renderView?.visitChildren(visitor);
  +          _forceRepaint();
           }
         );
         return true;
  
positive.code:         name: 'repaintRainbow',
          getter: () => debugRepaintRainbowEnabled,
          setter: (bool value) {
            debugRepaintRainbowEnabled = value;
          }
        );
        return true;
  
negative.code:     renderView.hitTest(result, position: position);
      super.hitTest(result, position);
    }
  
    void _forceRepaint() {
      RenderObjectVisitor visitor;
      visitor = (RenderObject child) {
        child.markNeedsPaint();
        child.visitChildren(visitor);
      };
      instance?.renderView?.visitChildren(visitor);
    }
  }
  
  /// Prints a textual representation of the entire render tree.
  