anchor.diff:  /// you're looking for, it's easy to create custom list items with a
   /// combination of other widgets, such as [Row]s and [Column]s.
   ///
  -/// {@tool snippet --template=stateless_widget_material}
  +/// {@tool snippet --template=stateless_widget_scaffold}
   ///
   /// Here is an example of a custom list item that resembles a Youtube related
   /// video list item created with [Expanded] and [Container] widgets.
  
positive.code: ///       crossAxisAlignment: CrossAxisAlignment.start,
  ///       children: <Widget>[
  ///         Expanded(
  ///           flex: 3,
  ///           child: Column(
  ///             crossAxisAlignment: CrossAxisAlignment.start,
  ///             children: <Widget>[
  ///               Text(
  ///                 '$title',
  ///                 maxLines: 1,
  ///                 overflow: TextOverflow.ellipsis,
  ///                 style: const TextStyle(
  ///                   fontWeight: FontWeight.bold,
  
negative.code: ///
  /// ```dart
  /// Widget build(BuildContext context) {
  ///   return ListView(
  ///     padding: const EdgeInsets.all(8.0),
  ///     itemExtent: 106.0,
  ///     children: <CustomListItem>[
  ///       CustomListItem(
  ///         user: 'Flutter',
  ///         viewCount: 999000,
  ///         thumbnail: Container(
  ///           decoration: const BoxDecoration(color: Colors.blue),
  ///         ),
  ///         title: 'The Flutter YouTube Channel',
  ///       ),
  ///       CustomListItem(
  ///         user: 'Dash',
  ///         viewCount: 884000,
  ///         thumbnail: Container(
  ///           decoration: const BoxDecoration(color: Colors.yellow),
  ///         ),
  ///         title: 'Announcing Flutter 1.0',
  ///       ),
  ///     ],
  ///   );
  /// }
  /// ```
  /// {@end-tool}
  ///
  /// {@tool snippet --template=stateless_widget_scaffold}
  ///
  /// Here is an example of an article list item with multi-line titles and
  /// subtitles. It utilizes [Row]s and [Column]s, as well as [Expanded] and
  /// [AspectRatio] widgets to organize its layout.
  ///
  