anchor.diff:  }
   
   /// Renders our RadarChart, also handles hitTest.
  -class RenderRadarChart extends RenderBox {
  +class RenderRadarChart extends RenderBox implements MouseTrackerAnnotation {
     RenderRadarChart(RadarChartData data, RadarChartData targetData, double textScale,
         RadarTouchCallback? touchCallback)
         : _data = data,
  
positive.code: 
      _touchCallback?.call(response);
    }
  }
  
negative.code:   @override
    void handleEvent(PointerEvent event, covariant BoxHitTestEntry entry) {
      assert(debugHandleEvent(event, entry));
      _handleEvent(event);
    }
  
    @override
    PointerExitEventListener? get onExit => (PointerExitEvent event) {
          _handleEvent(event);
        };
  
    @override
    PointerEnterEventListener? get onEnter => null;
  
    @override
    MouseCursor get cursor => MouseCursor.defer;
  
    @override
    bool get validForMouseTracker => _validForMouseTracker;
  
    void _handleEvent(PointerEvent event) {
      if (_touchCallback == null) {
        return;
      }
  