title: SafeArea not working in persistent bottomsheet in Flutter
body: <p>I am using MaterialApp and Scaffold + SafeArea for screens. All works well until I try to use persistent BottomSheet. BottomSheet content igores SafeArea and are shown below system controls, for example in iPhone X. </p>
  
  <p>I tried to wrap BottomSheet contents in another SafeArea element, but it did not help. </p>
  
  <p>Is there a way to get the same functionality as SafeArea to work in BottomSheet? If yes then how? </p>