Otherwise, we would think its visibility needs to be cleared.
This CL:
- reverts parts of eb5a5920b7,
- prevents sending redundant MSG_DISPATCH_SYSTEM_UI_VISIBILITY, and
- cancels clearing visibility if a new reversed visibility is set.
Fix: 156994866
Test: atest --iterations 100 LayoutTests#testAddingImmersiveWindow
atest WindowInsetsControllerTests InsetsAnimationControlImplTest
Change-Id: I8b8b7541523c0a94daf336f3be415aa5fa3f33da
2ab590a4b8