A11y crash on macOS when QWidgetPrivate::setVisible()

Consuming QT through OBS.

There is an intermittent crash that occurs on macOS when renaming sources, or some time after renaming sources and subsequently interacting with the UI in any way, in OBS. The crash occurs in AppKit and seems to have to do with Accessibility and string checking, but I can't discern too much more beyond that. It can occur in different specific circumstances, but seems to be connected to renaming sources or groups.

I am attaching two traces that show the crash occurring in disparate circumstances: once when trying to hit enter on renaming a source, prompting a modal. The other several seconds after renaming a source, when trying to create a new window to add another source. The common factor in both traces is an initial call to libqcocoa's `ZN20QCocoaSystemTrayIcon13emitActivatedEv`, followed by a lengthy jaunt through NSWindow and NSAccessibility attribute accessors, then another call to `ZN20QCocoaSystemTrayIcon13emitActivatedEv` that prompts an exception in CoreFoundation.