Merge "Clean up windows which stuck in animatingExit state." into sc-v2-dev am: 85aacccba1 am: b4123126bb

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/16296642

Change-Id: Ife63117c78683eacd2fca2953637a0904512af59