[BottomSheet] Widget.Material3.BottomSheet.Modal should have enableEdgeToEdge by default, otherwise there will be a gap at the system navigation bar if the app uses a custom theme

[ashnohe]

Widget.Material3.BottomSheet.Modal should have <item name="enableEdgeToEdge">true</item> by default for SDK 35+, otherwise there will be a gap at the system navigation bar if the app uses a custom theme that inherits from Widget.Material3.BottomSheet.Modal and targets SDK 35 (at which point edge-to-edge is enforced).

See attached images, one showing a gap without enableEdgeToEdge and without a gap with enableEdgeToEdge.

The documentation should also be updated to talk about the new BottomSheet behavior.

[manabu-nakamura]

Use not descendants of Widget.material3.BottomSheet.Modal but descendants of ThemeOverlay.material3.BottomSheetDialog.
https://github.com/material-components/material-components-android/blob/master/lib/java/com/google/android/material/theme/res/values/themes_base.xml#L100:
https://github.com/material-components/material-components-android/blob/master/lib/java/com/google/android/material/theme/res/values/themes_base.xml#L396:

<item name="bottomSheetDialogTheme">@style/ThemeOverlay.Material3.BottomSheetDialog</item>