title: In flutter, how to use Semantic on SliverPersistentHeader?
body: <ul>
  <li>I Want to make SliverPersistentHeader as a semantics.</li>
  </ul>
  <blockquote>
  <p>SliverPersistentHeader is a horizontal list</p>
  </blockquote>
  <ul>
  <li>some error info</li>
  </ul>
  <blockquote>
  <p>FlutterError (A RenderViewport expected a child of type RenderSliver but received a child of type RenderSemanticsAnnotations.</p>
  </blockquote>
  <hr />
  <p>Here is source example which I would rewrite:
  <a href="https://github.com/rydmike/flex_color_scheme/blob/master/example/lib/example5/widgets/pages/large_grid_view.dart#L164" rel="nofollow noreferrer">https://github.com/rydmike/flex_color_scheme/blob/master/example/lib/example5/widgets/pages/large_grid_view.dart#L164</a></p>
  <blockquote>
  <p>playground <a href="https://rydmike.com/flexcolorscheme/themesplayground-v5" rel="nofollow noreferrer">https://rydmike.com/flexcolorscheme/themesplayground-v5</a></p>
  </blockquote>
  <hr />