[TIMOB-11458] iOS: Accessibility: hide TiUIWindow when another window opens on top; send accessibility notification about screen update

[mstepanov]

TIMOB-11458

Test case in JIRA. + KS Window tests

[vishalduggal]

Code Reviewed. ACCEPTED

[vishalduggal]

FR Failed?.

The test in the ticket passes but there is one behavior change which might or might not be an issue.
Basically if a window is opened and is not full screen or does not provide an explicit way to close it, the app is stuck. For example with Voice Over On try
Base UI->Window Properties->Layout/Dimension Properties.
Once the button is clicked, the app is stuck because all other elements on screen are disabled (including tabs)

REJECTED

[mstepanov]

@vishalduggal I think it's expected behavior. that test is just not accessibility-friendly.

[vishalduggal]

ok. Am accepting the PR as is. I do think we should document guidelines for good UI design for accessibility apps on iOS.

ACCEPTED