Merge "Handle swipe down on taskbar to stash" into tm-qpr-dev am: 2b8b47952f am: 0324f024b0

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/22147222

Change-Id: I255cf982e558e780fde95f51113a08abbaa672ea
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>