tree 76a0352e66669ab539561a9345bf7ba8877a03f6
parent 81e85863e5e0c2801d2c48720d46e3e443dd10a8
author Chris Li <lihongyu@google.com> 1619546590 -0700
committer Chris Li <lihongyu@google.com> 1620706959 +0000

Fix NPE for checking immersive confirmation window root feature

This may happen when the immersive mode change is triggered from
the window removal. In this case, it will not be attached to a root.

Bug: 186072738
Test: manual
Change-Id: I546f9f651e3f6a26f506ed7269683b9bffa32926