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

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

Change-Id: Ibd0f8e33cdfc98c0abe1a5958bccbfac5a4d6515