Merge "Add getAdjacentTaskFragment check for the split screen case" into tm-dev am: d60f5664 am: 7a988c66 am: c38918e8

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



Change-Id: I541da5f5a6b855e71aac30c66461b6090302ee20
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>