anchor.diff:  ///
   /// To use this class, objects should register their event handler like so:
   ///
  -/// {@tool snippet}
   /// ```dart
   /// void handleSignalEvent(PointerSignalEvent event) {
   ///   GestureBinding.instance!.pointerSignalResolver.register(event, (PointerSignalEvent event) {
  
positive.code: ///     child: Stack(
  ///       fit: StackFit.expand,
  ///       children: <Widget>[
  ///         Listener(
  ///           onPointerSignal: (PointerSignalEvent event) {
  ///             if (useResolver) {
  ///               GestureBinding.instance!.pointerSignalResolver.register(event, (PointerSignalEvent event) {
  ///                 rotateOuterColor();
  ///               });
  ///             } else {
  ///               rotateOuterColor();
  ///             }
  ///           },
  ///           child: DecoratedBox(
  ///             decoration: BoxDecoration(
  ///               border: const Border.fromBorderSide(BorderSide()),
  ///               color: outerColor.toColor(),
  ///             ),
  ///             child: FractionallySizedBox(
  ///               widthFactor: 0.5,
  ///               heightFactor: 0.5,
  ///               child: DecoratedBox(
  ///                 decoration: BoxDecoration(
  ///                   border: const Border.fromBorderSide(BorderSide()),
  ///                   color: innerColor.toColor(),
  ///                 ),
  ///                 child: Listener(
  ///                   onPointerSignal: (PointerSignalEvent event) {
  ///                     if (useResolver) {
  ///                       GestureBinding.instance!.pointerSignalResolver.register(event, (PointerSignalEvent event) {
  ///                         rotateInnerColor();
  ///                       });
  ///                     } else {
  ///                       rotateInnerColor();
  ///                     }
  ///                   },
  ///                   child: const AbsorbPointer(),
  ///                 ),
  ///               ),
  ///             ),
  ///           ),
  ///         ),
  
negative.code: ///   });
  /// }
  /// ```
  ///
  /// {@tool dartpad --template=stateful_widget_material}
  /// Here is an example that demonstrates the effect of not using the resolver
  /// versus using it.
  ///
  /// When this example is set to _not_ use the resolver, then triggering the
  /// mouse wheel over the outer box will cause only the outer box to change
  /// color, but triggering the mouse wheel over the inner box will cause _both_
  /// the outer and the inner boxes to change color (because they're both
  /// receiving the event).
  ///
  /// When this example is set to _use_ the resolver, then only the box located
  /// directly under the cursor will change color when the mouse wheel is
  /// triggered.
  ///
  /// ```dart imports
  /// import 'package:flutter/gestures.dart';
  /// ```
  ///
  /// ```dart preamble
  /// class ColorChanger extends StatefulWidget {
  ///   const ColorChanger({
  ///     Key? key,
  ///     required this.initialColor,
  ///     required this.useResolver,
  ///     required this.child,
  ///   }) : super(key: key);
  ///
  ///   final HSVColor initialColor;
  ///   final bool useResolver;
  ///   final Widget child;
  ///
  ///   @override
  ///   _ColorChangerState createState() => _ColorChangerState();
  /// }
  ///
  /// class _ColorChangerState extends State<ColorChanger> {
  ///   late HSVColor color;
  ///
  ///   void rotateColor() {
  ///     setState(() {
  ///       color = color.withHue((color.hue + 6) % 360.0);
  ///     });
  ///   }
  ///
  ///   @override
  ///   void initState() {
  ///     super.initState();
  ///     color = widget.initialColor;
  ///   }
  ///
  ///   @override
  ///   Widget build(BuildContext context) {
  ///     return DecoratedBox(
  ///       decoration: BoxDecoration(
  ///         border: const Border.fromBorderSide(BorderSide()),
  ///         color: color.toColor(),
  ///       ),
  ///       child: Listener(
  ///         onPointerSignal: (PointerSignalEvent event) {
  ///           if (widget.useResolver) {
  ///             GestureBinding.instance!.pointerSignalResolver.register(event, (PointerSignalEvent event) {
  ///               rotateColor();
  ///             });
  ///           } else {
  ///             rotateColor();
  ///           }
  ///         },
  ///         child: widget.child,
  ///       ),
  ///     );
  ///   }
  /// }
  /// ```
  ///
  /// ```dart
  /// bool useResolver = false;
  ///
  /// @override
  /// Widget build(BuildContext context) {
  