Merge "Add getAdjacentTaskFragment check for the split screen case" into tm-dev am: d60f5664 am: 4ce0717d am: 17fad58a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18356918



Change-Id: I111b51b500e6f20b301874b15bffdcdb7819689c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>