Merge "Implement splitting from Taskbar long-press" into tm-dev am: e15927eec7 am: 455c6a3b28

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

Change-Id: I1681a8556cc3e224b62d02d393087c1b9c63de41
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>