Sync all AccessibilityControllers when an a11y query is received.

[m-sasha]

In commit 0367360, the syncing of AccessibilityControllers was broken by changing the lastUseTime property from being global to being local to an AccessibilityController. This resulted in a newly created AccessibilityController (e.g. for a Popup) not syncing immediately, essentially making its contents invisible to the OS's a11y.

RelNode: Fix syncing of AccessibilityController to correctly expose Dialog/Popup/DropdownMenu contents to the OS's a11y system.

Proposed Changes

Make the accessibility lastUseTime flag global again, and correctly sync all live AccessibilityControllers when it is modified.

Testing

Tested manually with this:

fun main() = singleWindowApplication {
    var menuOpenState by remember { mutableStateOf(false) }
    Text("Menu", Modifier.semantics { role = Role.Button }.clickable { menuOpenState = !menuOpenState })
    DropdownMenu(
        expanded = menuOpenState,
        onDismissRequest = { menuOpenState = false },
        properties = PopupProperties(focusable = true)
    ) {
        DropdownMenuItem(onClick = {}) { Text("Menu item 1") }
        DropdownMenuItem(onClick = {}) { Text("Menu item 2") }
        DropdownMenuItem(onClick = {}) { Text("Menu item 3") }
    }
}

Unfortunately I couldn't make a working unit test for this because the querying itself (of accessibles) on an AccessibleController causes it to sync. A Heisenberg's accessible.

Issues Fixed

Fixes: https://youtrack.jetbrains.com/issue/COMPOSE-1303/VoiceOver-doesnt-read-DropDown-menu

[elijah-semyonov]

@m-sasha
Looks OK, but tests disagree

[m-sasha]

The tests were wrong.