Merge "Fix task root bounds be overwritten when dismiss split screen." into...

Merge "Fix task root bounds be overwritten when dismiss split screen." into rvc-dev am: 49ded461 am: 6f5e6799 am: a5c1755a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11818545

Change-Id: Iddcad051ec8e1c9ec9d54a0de2f584141002ef60