anchor.diff:    _ThumbPressGestureRecognizer({
       required Object super.debugOwner,
       required GlobalKey customPaintKey,
  -    required Duration pressDuration,
  -  }) : _customPaintKey = customPaintKey,
  -       super(
  -         duration: pressDuration,
  -       );
  +    required super.duration,
  +  }) : _customPaintKey = customPaintKey;
   
     final GlobalKey _customPaintKey;
   
  
positive.code:     _shape = value;
      notifyListeners();
    }
    /// The amount of space by which to inset the scrollbar's start and end, as
    /// well as its side to the nearest edge, in logical pixels.
    ///
  
negative.code: // track and ignores everything else, including the thumb.
  class _TrackTapGestureRecognizer extends TapGestureRecognizer {
    _TrackTapGestureRecognizer({
      required super.debugOwner,
      required GlobalKey customPaintKey,
    }) : _customPaintKey = customPaintKey;
  
    final GlobalKey _customPaintKey;
  
  