anchor.diff:    ///
     /// Defaults to true.
     ///
  -  /// {@tool dartpad --template=stateless_widget_scaffold_no_null_safety}
  +  /// {@tool dartpad --template=stateless_widget_scaffold}
     /// This example shows how to create a pannable table. Because the table is
     /// larger than the entire screen, setting `constrained` to false is necessary
     /// to allow it to be drawn to its full size. The parts of the table that
  
positive.code: ///   * The [Flutter Gallery's transformations demo](https://github.com/flutter/gallery/blob/master/lib/demos/reference/transformations_demo.dart),
  ///     which includes the use of InteractiveViewer.
  ///
  /// {@tool dartpad --template=stateless_widget_scaffold_no_null_safety}
  /// This example shows a simple Container that can be panned and zoomed.
  ///
  /// ```dart
  
negative.code:   ///     begin: _transformationController.value,
    ///     end: Matrix4.identity(),
    ///   ).animate(_controllerReset);
    ///   _animationReset!.addListener(_onAnimateReset);
    ///   _controllerReset.forward();
    /// }
    ///
  