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

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

Change-Id: I37010a19e5477c8af16b82a08011de345308832a