tree 7031acd34fef0c4b0d1e5a4ede0fe1962fb57d74
parent 4ff2f7697c0267187a97292c727dbba15c804931
author Winson Chung <winsonc@google.com> 1620876793 -0700
committer Winson Chung <winsonc@google.com> 1620876812 -0700

Skip setting up ui if the handler is already invalidated

- Also unregister the task stack listener in case the restart
  message comes in right before the animation is finished

Bug: 186760990
Test: Swipe up/quickswitch repeatedly
Change-Id: I5af7a26f05e7c15e099d6666e4662fd1af9aa861