tree 1c436b3ccb03fff7ed7a841c54a7d1b1d8234cdc
parent 29f12866c2d574d520ce8e718b8eac2041c29d4d
author Louis Chang <louischang@google.com> 1602566562 +0800
committer Louis Chang <louischang@google.com> 1602567812 +0800

Remove activity from stopping list when removed from display

Organized tasks and its children were removed when systemui died.
And the activities should no longer waiting to be stopped.

Also prevent NPE if the transaction is applied to a unknown WC.

Bug: 170451499
Test: presubmit tests
Change-Id: I2fcef2ffc8c962c0dac3b56cdbea4f17e071152d