Add the notification engine that posts AX events after redisplay, and
implement the mode-line accessibility element.
* src/nsterm.h (EmacsAccessibilityBuffer): Add cachedCharsModiff
property; declare cursor and completion notification methods.
* src/nsterm.m (ns_ax_mode_line_text): New static function; extracts
mode-line text from glyph matrix.
(ns_ax_completion_string_from_prop): New static function.
(ns_ax_find_completion_overlay_range): New static function.
(ns_ax_event_is_line_nav_key): New static function.
(ns_ax_completion_text_for_span): New static function.
(EmacsAccessibilityBuffer Notifications): Category implementing
postTextChangedNotification, postFocusedCursorNotification,
postCompletionAnnouncementForBuffer, and
postAccessibilityNotificationsForFrame.
(postAccessibilityNotificationsForFrame:): Detect buffer switch and
reset cached state with explicit VoiceOver notifications, so that
split-window scenarios do not leave VoiceOver silent.
(EmacsAccessibilityModeLine): Full implementation.
(syms_of_nsterm): Add DEFSYMs for navigation and completion symbols.
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Martin Sukany
2371c8d694