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Draft: a11y: Watch EventListenerRegistered/Deregistered signals

Emmanuele Bassi requested to merge ebassi/lazier-a11y into main

Assistive technologies using AT-SPI typically register themselves on the accessibility bus through the org.a11y.atspi.Registry.RegisterEvent method, which will emit the EventListenerRegistered signal. We can use that signal (and its corresponding EventListenerDeregistered sibling) to know whether there is at least an AT on the other side of the accessibility bus.

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