fix(Android): crash on tab change with open form sheet

[kkafar]

Description

This PR fixes android crash when changing tab with formSheet opened.

The fix is achieved by not triggering dismissSelf() in the ON_STOP lifecycle event, which was intended to run with native events, such as pulling the sheet down, but was also triggered by this particular case - causing the FragmentManager is already executing transactions ERROR.

To ensure the dismissal is correctly triggered by the native events, a NativeDismissalObserver was created and is triggered by BottomSheetBehavior.STATE_HIDDEN state change.

After applying the fix another problem appeared: upon re-visiting a tab with formSheet opened it's background turned transparent.

During the first attachShapeToScreen screens background property is replaced with shape of type MaterialShapeDrawable. Thus on each subsequent call the (screen.background as? ColorDrawable?)?.color property is unreachable as it's not ColorDrawable anymore. It's fixed by looking for (screen.background as? MaterialShapeDrawable?)?.tintList?.defaultColor fallback.

Fixes #2379 .

Changes

• added nativeDismissalObserver
• fixed sheet bg color not applying when re-visited.
• added Test2379 repro

Test code and steps to reproduce

• use Test2379 repro

Checklist

• Included code example that can be used to test this change
• Ensured that CI passes