ps://api.flutter.dev/flutter/widgets/LocalHistoryEntry-class.html">LocalHistoryEntry</a> for the enclosing
<a href="https://api.flutter.dev/flutter/widgets/ModalRoute-class.html">ModalRoute</a> and a back button is added to the app bar of the <a href="https://api.flutter.dev/flutter/material/Scaffold-class.html">Scaffold</a>
that closes the bottom sheet.</p>
<p>To create a persistent bottom sheet that is not a <a href="https://api.flutter.dev/flutter/widgets/LocalHistoryEntry-class.html">LocalHistoryEntry</