anchor.diff:  ///             rotateColor();
   ///           }
   ///         },
  -///         child: widget.child,
  +///         child: Stack(
  +///           fit: StackFit.expand,
  +///           children: <Widget>[
  +///             const AbsorbPointer(),
  +///             if (widget.child != null) widget.child!,
  +///           ],
  +///         ),
   ///       ),
   ///     );
   ///   }
  
positive.code: ///
  ///   void rotateColor() {
  ///     setState(() {
  ///       color = color.withHue((color.hue + 6) % 360.0);
  ///     });
  ///   }
  ///
  
negative.code: ///     Key? key,
  ///     required this.initialColor,
  ///     required this.useResolver,
  ///     this.child,
  ///   }) : super(key: key);
  ///
  ///   final HSVColor initialColor;
  ///   final bool useResolver;
  ///   final Widget? child;
  ///
  ///   @override
  ///   _ColorChangerState createState() => _ColorChangerState();
  