Set mShowing to false after the dialog dismissed

And make sure all the show/dismiss events are in a sequence.

BUG: 109936524
Test: manual
Change-Id: I1c20cb1cfb84c97fb386857680399cd74ed063f9
(cherry picked from commit fdc4cab04e56c3813ded8f362cd4a3603d92a7f5)
1 file changed