Merge "Unstash taskbar when transitioning to fallback overview." into tm-qpr-dev am: 98f40039

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/20187724



Change-Id: I83f29014f6bd50a3bcb3fc2ebf964163438bbcbb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>