anchor.diff:  }
   
   /// A material widget displayed at the bottom of an app for selecting among a
  -/// small number of views.
  +/// small number of views, typically between three and five.
   ///
   /// The bottom navigation bar consists of multiple items in the form of
   /// text labels, icons, or both, laid out on top of a piece of material. It
  
positive.code: ///
  /// A bottom navigation bar is usually used in conjunction with a [Scaffold],
  /// where it is provided as the [Scaffold.bottomNavigationBar] argument.
  ///
  /// See also:
  ///
  
negative.code:   /// The color of the selected item when bottom navigation bar is
    /// [BottomNavigationBarType.fixed].
    ///
    /// If [fixedColor] is null then the theme's primary color,
    /// [ThemeData.primaryColor], is used. However if [BottomNavigationBar.type] is
    /// [BottomNavigationBarType.shifting] then [fixedColor] is ignored.
    final Color fixedColor;
  
    /// The size of all of the [BottomNavigationBarItem] icons.
  