patches: fix O(position) performance via UAZoomEnabled caching
Root cause (per Opus analysis): UAZoomEnabled() is a synchronous Mach IPC roundtrip to macOS Accessibility server, called 3x per redisplay cycle. At 60fps = 180 IPC roundtrips/second blocking the main thread. Combined with Emacs's inherent O(position) redisplay cost, this compounded into progressive choppy behavior. Fix 1: ns_zoom_enabled_p() caches UAZoomEnabled() for 1 second. Fix 2: ns_zoom_track_completion() rate-limited to 2 Hz. Also includes BUF_CHARS_MODIFF fix (patch 0009) for VoiceOver cache.
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@@ -1,7 +1,7 @@
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From e6800d12d350def06dd6475fcb807ceaf7f82e02 Mon Sep 17 00:00:00 2001
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From a750bf8ae17dd0dd6c14a23376d012c61367227f Mon Sep 17 00:00:00 2001
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From: Martin Sukany <martin@sukany.cz>
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Date: Sat, 28 Feb 2026 12:58:11 +0100
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Subject: [PATCH 02/10] ns: add accessibility base classes and text extraction
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Subject: [PATCH 02/11] ns: add accessibility base classes and text extraction
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Add the foundation for macOS VoiceOver accessibility in the NS
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(Cocoa) port. No existing code paths are modified.
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