Merge "Polish taskbar un/stash animation." into tm-qpr-dev am: 4c368373 am: 55b2ec2d

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/21751712



Change-Id: Ic9a5fca03c29b3a4ec0b6898cc4b27e59850d2df
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>