Merge "Revert "Revert "Add a way to stash/unstash transient taskbar.""" into tm-qpr-dev am: 8ed5ac05fd

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/20356225

Change-Id: I105e7ac5928083ef4d3793c76a0da357338c8b3b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>