Merge "Move the pinned task to front when dismissed split-screen" into rvc-dev...

Merge "Move the pinned task to front when dismissed split-screen" into rvc-dev am: 92d8d6c3 am: 9b2e5941 am: 1cbf002f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12034169

Change-Id: I791a73690816323daa548102018c3ad2933e8275