Merge "Implement splitting from Taskbar long-press" into tm-dev am: e15927eec7 am: 4fcc3bf646

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/17530994

Change-Id: I38d41c720771d5210c63ecde7170c2b6f7b75fae
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>