Merge "Forces a back region for sandbox even if gesture nav is disabled." into sc-dev am: e0a94aa750 am: c229b84d64 am: 14cec74c6d

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14513829

Change-Id: I145cefa1133a95f9fdf6af132cce25e9fad342e8