Fix crash/flicker with taskbar when canceling drag and drop am: 729eb845 am:...

Fix crash/flicker with taskbar when canceling drag and drop am: 729eb845 am: 0cb7c659 am: 1c1d2b5d

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/17776925



Change-Id: Id7fc48ec5c53c3fed61ed8c27b3363e2ce59010d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>