anchor.diff:              Expanded(
                 child: Scaffold(
                   appBar: AppBar(),
  -                body: widget.body,
  -                floatingActionButton: widget.floatingActionButton,
  +                body: body,
  +                floatingActionButton: floatingActionButton,
                 ),
               ),
             ],
  
positive.code:   final FloatingActionButton floatingActionButton;
    final NavigationTypeResolver navigationTypeResolver;
  
    AdaptiveNavigationScaffold({
      this.title,
      this.body,
      @required this.currentIndex,
  
negative.code: /// A widget that adapts to the current display size, displaying a [Drawer],
  /// [NavigationRail], or [BottomNavigationBar]. Navigation destinations are
  /// defined in the [destinations] parameter.
  class AdaptiveNavigationScaffold extends StatelessWidget {
    final Widget title;
    final Widget body;
    final int currentIndex;
  