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

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

Change-Id: Ibdb0d8bb8b2588bae8e5856a8bfdfd82b9a5e2d3