Create a method to constrain the bottom sheet to the current scaffold

[alguintu]

What is the new or updated feature that you are suggesting?

Create a method to constrain the bottom sheet to the current scaffold much like how a normal call to showBottomSheet() works.

Why should this feature be included?

Currently, the showFlexibleBottomSheet() method pushes a new activity on top on the whole navigator

return Navigator.of(context, rootNavigator: useRootNavigator).push(
    _FlexibleBottomSheetRoute<T>(
      theme: Theme.of(context),
      ...
    ),
  );

instead of the default behavior of showBottomSheet() that calls:

return Scaffold.of(context).showBottomSheet<T>(
    builder,
    ...
  );

so the resulting bottom sheet goes only on top of the scaffold where it is called.

Additional context

This use-case is important for responsive web and desktop builds where there can be more than one scaffold currently on screen, and it is required that a bottomSheet only appear above the current scaffold.

If there is a way to achieve this currently, please let me know. Much appreciated.