anchor.diff:      }, acceptOutsideGlasspane: true);
   
       _addWheelEventListener((html.Event event) {
  -      _handleWheelEvent(event, _callback);
  +      _handleWheelEvent(event);
       });
     }
   
  
positive.code:     );
    }
  
    void _handleWheelEvent(
        html.Event e, void Function(Iterable<ui.PointerData>) sink) {
      assert(e is html.WheelEvent);
      final html.WheelEvent event = e as html.WheelEvent;
      if (_debugLogPointerEvents) {
  
negative.code:     });
  
      _addWheelEventListener((html.Event event) {
        _handleWheelEvent(event);
      });
    }
  
  