Merge "Detach nav bar from app after settling into overview" into sc-dev am: 3ed7ee76c4 am: 9aa11a9cd7

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14543545

Change-Id: I24244e0bace3e571005d0c40a2daa8e74b2a56e5