[automerger skipped] Merge "Clear all starting window while unregister...

[automerger skipped] Merge "Clear all starting window while unregister organizer." into sc-v2-dev am: 596c0279 am: 86caa03b -s ours

am skip reason: Merged-In I93e4862b7f866c7c73d9b3999a74e03784848058 with SHA-1 7695b749 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/16332299

Change-Id: I8620436dce85acbab31cc0e617eee31353f3f50a