anchor.diff:    final GestureScaleEndCallback onScaleEnd;
   
     /// How this gesture detector should behave during hit testing.
  +  ///
  +  /// This defaults to [HitTestBehavior.deferToChild] if [child] is not null and
  +  /// [HitTestBehavior.translucent] if child is null.
     final HitTestBehavior behavior;
   
     /// Whether to exclude these gestures from the semantics tree. For
  
positive.code:   final Map<Type, GestureRecognizerFactory> gestures;
  
    /// How this gesture detector should behave during hit testing.
    final HitTestBehavior behavior;
  
    /// Whether to exclude these gestures from the semantics tree. For
  
negative.code: ///   ),
  /// )
  /// ```
  ///
  /// ## Debugging
  ///
  /// To see how large the hit test box of a [GestureDetector] is for debugging
  /// purposes, set [debugPaintPointersEnabled] to true.
  class GestureDetector extends StatelessWidget {
    /// Creates a widget that detects gestures.
    ///
  