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: c10b144b am: ea838912

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

Change-Id: I6d1b8231d99648482a0358c8f1e0d568ab5d80b5