Daneel 111013ddf1 patches: fix VoiceOver deadlock — async AX notification posting ...

NSAccessibilityPostNotification may synchronously invoke VoiceOver
callbacks from a background AX server thread.  Those callbacks call
dispatch_sync(main_queue) to read buffer state.  If the main thread
is still inside the notification-posting method (postAccessibilityUpdates,
windowDidBecomeKey, or postAccessibilityNotificationsForFrame), the
dispatch_sync deadlocks.

Symptom: Emacs hangs on C-x o after M-x list-buffers from Completions
buffer, but only with VoiceOver enabled.

Fix: introduce ns_ax_post_notification() and
ns_ax_post_notification_with_info() wrappers that defer notification
posting via dispatch_async(main_queue).  This lets the current method
return and frees the main queue for VoiceOver's dispatch_sync calls.

All 14 notification-posting sites now use the async wrappers.

2026-02-27 15:41:26 +01:00

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