When Material 3 is enabled on Android, toggling a CheckBox or Switch that is inside a ScrollView causes the AppBarLayout surface color to flicker. The flicker is most visible after scrolling down — the AppBar briefly flashes between its lifted (scrolled) and non-lifted states on every toggle.

Expected Behavior
The AppBar should remain in its lifted state without any visual change when toggling controls.

Actual Behavior
The AppBar flickers — it briefly flashes to the non-lifted surface color and back on every CheckBox/Switch state change. The flicker is caused by the state-change animation triggering a layout pass, which causes AppBarLayout to re-evaluate its shouldLift() check.

Steps to reproduce

1. Create a page with a NavigationPage or Shell containing a ScrollView
2. Place several CheckBox or Switch controls inside the ScrollView
3. Ensure Material 3 is enabled.
4. Scroll the page down so the AppBar enters its "lifted" state (showing scrolledContainerColor)
5. Toggle any CheckBox or Switch. See the Appbar is flickering

AppBarFlickerRepo.zip