anchor.diff:  
     // MATERIAL BANNER API
   
  -  /// Shows a [MaterialBanner] across all registered [Scaffold]s.
  +  /// Shows a [MaterialBanner] across all registered [Scaffold]s. Scaffolds register
  +  /// to receive material banners from their closest [ScaffoldMessenger] ancestor.
  +  /// If there are several registered scaffolds the material banner is shown
  +  /// simultaneously on all of them.
     ///
     /// A scaffold can show at most one material banner at a time. If this function is
     /// called while another material banner is already visible, the given material banner
  
positive.code: ///    app. A bottom sheet can either be persistent, in which case it is shown
  ///    using the [ScaffoldState.showBottomSheet] method, or modal, in which case
  ///    it is shown using the [showModalBottomSheet] function.
  ///  * [ScaffoldState], which is the state associated with this widget.
  ///  * <https://material.io/design/layout/responsive-layout-grid.html>
  ///  * Cookbook: [Add a Drawer to a screen](https://flutter.dev/docs/cookbook/design/drawer)
  
negative.code: 
    // SNACKBAR API
  
    /// Shows a [SnackBar] across all registered [Scaffold]s. Scaffolds register
    /// to receive snack bars from their closest [ScaffoldMessenger] ancestor.
    /// If there are several registered scaffolds the snack bar is shown
    /// simultaneously on all of them.
    ///
    /// A scaffold can show at most one snack bar at a time. If this function is
    /// called while another snack bar is already visible, the given snack bar
  