Merge "Stash taskbar when IME is present, including during gestures" into sc-v2-dev am: b4aefc1277 am: cc6b8488bf

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/16325264

Change-Id: I7c71ae9aa8c949907286c31a2e6c75871e599ec7