anchor.diff:  /// ** See code in examples/api/lib/material/reorderable_list/reorderable_list_view.0.dart **
   /// {@end-tool}
   ///
  -/// This example demonstrates using the [proxyDecorator] callback to customize the appearance of
  -/// a list item while it's being dragged.
  +/// By default, on [TargetPlatformVariant.desktop] platforms each item will
  +/// have a drag handle added on top of it that will allow the user to grab it
  +/// to move the item. On [TargetPlatformVariant.mobile], no drag handle will be
  +/// added, but when the user long presses anywhere on the item it will start
  +/// moving the item. Displaying drag handles can be controlled with
  +/// [ReorderableListView.buildDefaultDragHandles].
  +///
  +/// All list items must have a key.
  +///
  +/// This example demonstrates using the [proxyDecorator] callback to customize
  +/// the appearance of a list item while it's being dragged.
   /// {@tool snippet}
   ///
  -/// While a drag is underway, the widget returned by the [proxyDecorator] serves as a "proxy" (a substitute)
  -/// for the item in the list. The proxy is created with the original list item as its child. The [proxyDecorator]
  -/// in this example is similar to the default one except that it changes the proxy item's background color.
  +/// While a drag is underway, the widget returned by the [proxyDecorator]
  +/// serves as a "proxy" (a substitute) for the item in the list. The proxy is
  +/// created with the original list item as its child. The [proxyDecorator]
  +/// in this example is similar to the default one except that it changes the
  +/// proxy item's background color.
   ///
   /// ** See code in examples/api/lib/material/reorderable_list/reorderable_list_view.1.dart **
   /// {@end-tool}
   class ReorderableListView extends StatefulWidget {
     /// Creates a reorderable list from a pre-built list of widgets.
  +  ///
  +  /// This constructor is appropriate for lists with a small number of
  +  /// children because constructing the [List] requires doing work for every
  +  /// child that could possibly be displayed in the list view instead of just
  +  /// those children that are actually visible.
     ///
     /// See also:
     ///
  
positive.code:   /// [ReorderableListView.builder] constructor. Using the [IndexedWidgetBuilder], The
    /// list items are built lazily on demand.
    /// {@tool dartpad}
    ///
    ///
    /// ** See code in examples/api/lib/material/reorderable_list/reorderable_list_view.reorderable_list_view_builder.0.dart **
    /// {@end-tool}
  
negative.code: 
  /// A list whose items the user can interactively reorder by dragging.
  ///
  /// {@youtube 560 315 https://www.youtube.com/watch?v=3fB1mxOsqJE}
  ///
  /// This sample shows by dragging the user can reorder the items of the list.
  