anchor.diff:  
     @override
     _RenderSliverPersistentHeaderForWidgetsMixin createRenderObject(BuildContext context) {
  -    // Not passing this snapConfiguration as a constructor parameter to avoid the
  -    // additional layers added due to https://github.com/dart-lang/sdk/issues/31543
  -    return _RenderSliverFloatingPinnedPersistentHeaderForWidgets()
  -      ..snapConfiguration = delegate.snapConfiguration;
  +    return _RenderSliverFloatingPinnedPersistentHeaderForWidgets(snapConfiguration: delegate.snapConfiguration);
     }
   
     @override
  
positive.code: 
    @override
    _RenderSliverPersistentHeaderForWidgetsMixin createRenderObject(BuildContext context) {
      // Not passing this snapConfiguration as a constructor parameter to avoid the
      // additional layers added due to https://github.com/dart-lang/sdk/issues/31543
      return _RenderSliverFloatingPersistentHeaderForWidgets()
        ..snapConfiguration = delegate.snapConfiguration;
    }
  
    @override
  
negative.code:   }
  }
  
  class _RenderSliverScrollingPersistentHeaderForWidgets extends RenderSliverScrollingPersistentHeader
    with _RenderSliverPersistentHeaderForWidgetsMixin { }
  
  class _SliverPinnedPersistentHeader extends _SliverPersistentHeaderRenderObjectWidget {
  