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patches: fold line index + remove NS_AX_TEXT_CAP into 0001-0002

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- 0001: remove NS_AX_TEXT_CAP (100K char cap), add lineStartOffsets/
  lineCount ivars and method declarations to nsterm.h
- 0002: add lineForAXIndex:/rangeForLine: O(log L) helpers, build line
  index in ensureTextCache, replace O(L) line scanning in
  accessibilityInsertionPointLineNumber/accessibilityLineForIndex/
  accessibilityRangeForLine, free index in invalidateTextCache/dealloc
- 0009 deleted (folded into 0001+0002)
- README.txt: remove NS_AX_TEXT_CAP references, update known
  limitations, stress test threshold 50K lines
This commit is contained in:
Daneel
2026-02-28 21:39:30 +01:00
parent 419762bde0
commit 30089e9413
10 changed files with 540 additions and 552 deletions
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44
patches/0001-ns-add-accessibility-base-classes-and-text-extractio.patch
View File

@@ -1,7 +1,7 @@
From 3bb5a0bed12de424e79a24228e6ae2b4a6e0ecf1 Mon Sep 17 00:00:00 2001
From d176c3c9d97574f0cd493d6491eda0a82ad28387 Mon Sep 17 00:00:00 2001
From: Martin Sukany <martin@sukany.cz>
Date: Sat, 28 Feb 2026 12:58:11 +0100
Subject: [PATCH 1/6] ns: add accessibility base classes and text extraction
Subject: [PATCH 1/8] ns: add accessibility base classes and text extraction
Add the foundation for macOS VoiceOver accessibility in the NS
(Cocoa) port. No existing code paths are modified.
@@ -15,7 +15,7 @@ Add the foundation for macOS VoiceOver accessibility in the NS
(EmacsAXSpanType): New enum.
(EmacsView): New ivars for accessibility state.
* src/nsterm.m: Include intervals.h for TEXT_PROP_MEANS_INVISIBLE.
(NS_AX_TEXT_CAP): New macro, 100000.
(ns_ax_buffer_text, ns_ax_mode_line_text, ns_ax_frame_for_range)
(ns_ax_completion_string_from_prop, ns_ax_window_buffer_object)
(ns_ax_window_end_charpos, ns_ax_text_prop_at)
@@ -29,15 +29,15 @@ ns-accessibility-enabled.
Tested on macOS 14 Sonoma with VoiceOver 10. Builds cleanly;
no functional change (dead code until patch 5/6 wires it in).
---
src/nsterm.h | 127 ++++++++++++++
src/nsterm.m | 468 +++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 595 insertions(+)
src/nsterm.h | 131 +++++++++++++++
src/nsterm.m | 456 +++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 587 insertions(+)
diff --git a/src/nsterm.h b/src/nsterm.h
index 7c1ee4c..51c30ca 100644
index 7c1ee4c..5298386 100644
--- a/src/nsterm.h
+++ b/src/nsterm.h
@@ -453,6 +453,118 @@ enum ns_return_frame_mode
@@ -453,6 +453,122 @@ enum ns_return_frame_mode
@end
@@ -87,6 +87,8 @@ index 7c1ee4c..51c30ca 100644
+{
+ ns_ax_visible_run *visibleRuns;
+ NSUInteger visibleRunCount;
+ NSUInteger *lineStartOffsets; /* AX string index of each line start. */
+ NSUInteger lineCount; /* Number of entries in lineStartOffsets. */
+ NSMutableArray *cachedInteractiveSpans;
+ BOOL interactiveSpansDirty;
+}
@@ -102,6 +104,8 @@ index 7c1ee4c..51c30ca 100644
+@property (nonatomic, assign) ptrdiff_t cachedCompletionOverlayEnd;
+@property (nonatomic, assign) ptrdiff_t cachedCompletionPoint;
+- (void)invalidateTextCache;
+- (NSInteger)lineForAXIndex:(NSUInteger)idx;
+- (NSRange)rangeForLine:(NSUInteger)line textLength:(NSUInteger)tlen;
+- (ptrdiff_t)charposForAccessibilityIndex:(NSUInteger)ax_idx;
+- (NSUInteger)accessibilityIndexForCharpos:(ptrdiff_t)charpos;
+@end
@@ -156,7 +160,7 @@ index 7c1ee4c..51c30ca 100644
/* ==========================================================================
The main Emacs view
@@ -471,6 +583,14 @@ enum ns_return_frame_mode
@@ -471,6 +587,14 @@ enum ns_return_frame_mode
#ifdef NS_IMPL_COCOA
char *old_title;
BOOL maximizing_resize;
@@ -171,7 +175,7 @@ index 7c1ee4c..51c30ca 100644
#endif
BOOL font_panel_active;
NSFont *font_panel_result;
@@ -528,6 +648,13 @@ enum ns_return_frame_mode
@@ -528,6 +652,13 @@ enum ns_return_frame_mode
- (void)windowWillExitFullScreen;
- (void)windowDidExitFullScreen;
- (void)windowDidBecomeKey;
@@ -186,7 +190,7 @@ index 7c1ee4c..51c30ca 100644
diff --git a/src/nsterm.m b/src/nsterm.m
index 74e4ad5..935919f 100644
index 74e4ad5..2ac1d9d 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -46,6 +46,7 @@ GNUstep port and post-20 update by Adrian Robert (arobert@cogsci.ucsd.edu)
@@ -197,7 +201,7 @@ index 74e4ad5..935919f 100644
#include "systime.h"
#include "character.h"
#include "xwidget.h"
@@ -6856,6 +6857,442 @@ ns_create_font_panel_buttons (id target, SEL select, SEL cancel_action)
@@ -6856,6 +6857,430 @@ ns_create_font_panel_buttons (id target, SEL select, SEL cancel_action)
}
#endif
@@ -211,12 +215,6 @@ index 74e4ad5..935919f 100644
+
+/* ---- Helper: extract buffer text for accessibility ---- */
+
+/* Maximum characters exposed via accessibilityValue. */
+/* Cap accessibility text at 100,000 UTF-16 units (~200 KB). VoiceOver
+ performance degrades beyond this; buffers larger than ~50,000 lines
+ are truncated for accessibility purposes. */
+#define NS_AX_TEXT_CAP 100000
+
+/* Build accessibility text for window W, skipping invisible text.
+ Populates *OUT_START with the buffer start charpos.
+ Populates *OUT_RUNS with an array of visible runs and *OUT_NRUNS
@@ -288,13 +286,7 @@ index 74e4ad5..935919f 100644
+ make_fixnum (pos), Qinvisible, Qnil, make_fixnum (zv));
+ ptrdiff_t run_end = FIXNUMP (next) ? XFIXNUM (next) : zv;
+
+ /* Cap total text at NS_AX_TEXT_CAP. */
+ ptrdiff_t run_len = run_end - pos;
+ if (ax_offset + (NSUInteger) run_len > NS_AX_TEXT_CAP)
+ run_len = (ptrdiff_t) (NS_AX_TEXT_CAP - ax_offset);
+ if (run_len <= 0)
+ break;
+ run_end = pos + run_len;
+
+ /* Extract this visible run's text. Use
+ Fbuffer_substring_no_properties which correctly handles the
@@ -640,7 +632,7 @@ index 74e4ad5..935919f 100644
/* ==========================================================================
EmacsView implementation
@@ -11312,6 +11749,28 @@ syms_of_nsterm (void)
@@ -11312,6 +11737,28 @@ syms_of_nsterm (void)
DEFSYM (Qns_drag_operation_generic, "ns-drag-operation-generic");
DEFSYM (Qns_handle_drag_motion, "ns-handle-drag-motion");
@@ -669,7 +661,7 @@ index 74e4ad5..935919f 100644
Fput (Qalt, Qmodifier_value, make_fixnum (alt_modifier));
Fput (Qhyper, Qmodifier_value, make_fixnum (hyper_modifier));
Fput (Qmeta, Qmodifier_value, make_fixnum (meta_modifier));
@@ -11460,6 +11919,15 @@ Note that this does not apply to images.
@@ -11460,6 +11907,15 @@ Note that this does not apply to images.
This variable is ignored on Mac OS X < 10.7 and GNUstep. */);
ns_use_srgb_colorspace = YES;

458
patches/0002-ns-implement-buffer-accessibility-element-core-proto.patch
View File

@@ -1,7 +1,7 @@
From b448ae7e4c129a12a4a5485f26f706614c0da1cd Mon Sep 17 00:00:00 2001
From 6f2e1b097c2ed1d2f45e99cf85792a1b28556202 Mon Sep 17 00:00:00 2001
From: Martin Sukany <martin@sukany.cz>
Date: Sat, 28 Feb 2026 12:58:11 +0100
Subject: [PATCH 2/6] ns: implement buffer accessibility element (core
Subject: [PATCH 2/8] ns: implement buffer accessibility element (core
protocol)
Implement the NSAccessibility text protocol for Emacs buffer windows.
@@ -18,14 +18,271 @@ setAccessibilityFocused.
Tested on macOS 14 with VoiceOver. Verified: buffer reading,
line-by-line navigation, word/character announcements.
---
src/nsterm.m | 1089 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 1089 insertions(+)
src/nsterm.m | 1346 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 1346 insertions(+)
diff --git a/src/nsterm.m b/src/nsterm.m
index 935919f..e80c3df 100644
index 2ac1d9d..fc5906a 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -7290,6 +7290,1095 @@ ns_ax_post_notification_with_info (id element,
@@ -6867,6 +6867,256 @@ ns_create_font_panel_buttons (id target, SEL select, SEL cancel_action)
/* ---- Helper: extract buffer text for accessibility ---- */
+/* Return true if FACE is or contains a face symbol whose name
+ includes "current" or "selected", indicating a highlighted
+ completion candidate. Works for vertico-current,
+ icomplete-selected-match, ivy-current-match, etc. */
+static bool
+ns_ax_face_is_selected (Lisp_Object face)
+{
+ if (SYMBOLP (face) && !NILP (face))
+ {
+ const char *name = SSDATA (SYMBOL_NAME (face));
+ /* Substring match is intentionally broad --- it catches
+ vertico-current, icomplete-selected-match, ivy-current-match,
+ company-tooltip-selection, and similar. False positives are
+ harmless since this runs only on overlay strings during
+ completion. */
+ if (strstr (name, "current") || strstr (name, "selected")
+ || strstr (name, "selection"))
+ return true;
+ }
+ if (CONSP (face))
+ {
+ for (Lisp_Object tail = face; CONSP (tail); tail = XCDR (tail))
+ if (ns_ax_face_is_selected (XCAR (tail)))
+ return true;
+ }
+ return false;
+}
+
+/* Extract the currently selected candidate text from overlay display
+ strings. Completion frameworks render candidates as overlay
+ before-string/after-string and highlight the current candidate
+ with a face whose name contains "current" or "selected"
+ (e.g. vertico-current, icomplete-selected-match, ivy-current-match).
+
+ Scan all overlays in the buffer region [BEG, END), find the line
+ whose face matches the selection heuristic, and return it (already
+ trimmed of surrounding whitespace).
+
+ Also set *OUT_LINE_INDEX to the 0-based visual line index of the
+ selected candidate (for Zoom positioning), counting only non-trivial
+ lines. Set to -1 if not found.
+
+ Returns nil if no selected candidate is found. */
+static NSString *
+ns_ax_selected_overlay_text (struct buffer *b,
+ ptrdiff_t beg, ptrdiff_t end,
+ int *out_line_index)
+{
+ *out_line_index = -1;
+
+ Lisp_Object ov_list = Foverlays_in (make_fixnum (beg),
+ make_fixnum (end));
+
+ for (Lisp_Object tail = ov_list; CONSP (tail); tail = XCDR (tail))
+ {
+ Lisp_Object ov = XCAR (tail);
+ Lisp_Object strings[2];
+ strings[0] = Foverlay_get (ov, intern_c_string ("before-string"));
+ strings[1] = Foverlay_get (ov, intern_c_string ("after-string"));
+
+ for (int s = 0; s < 2; s++)
+ {
+ if (!STRINGP (strings[s]))
+ continue;
+
+ Lisp_Object str = strings[s];
+ ptrdiff_t slen = SCHARS (str);
+ if (slen == 0)
+ continue;
+
+ /* Scan for newline positions using SDATA for efficiency.
+ The data pointer is used only in this loop, before any
+ Lisp calls (Fget_text_property etc.) that could trigger
+ GC and relocate string data. */
+ const unsigned char *data = SDATA (str);
+ ptrdiff_t byte_len = SBYTES (str);
+ /* 512 lines is sufficient for any completion UI;
+ vertico-count defaults to 10. */
+ ptrdiff_t line_starts[512];
+ ptrdiff_t line_ends[512];
+ int nlines = 0;
+ ptrdiff_t char_pos = 0, byte_pos = 0, lstart = 0;
+
+ while (byte_pos < byte_len && nlines < 512)
+ {
+ if (data[byte_pos] == '\n')
+ {
+ if (char_pos > lstart)
+ {
+ line_starts[nlines] = lstart;
+ line_ends[nlines] = char_pos;
+ nlines++;
+ }
+ lstart = char_pos + 1;
+ }
+ if (STRING_MULTIBYTE (str))
+ byte_pos += BYTES_BY_CHAR_HEAD (data[byte_pos]);
+ else
+ byte_pos++;
+ char_pos++;
+ }
+ if (char_pos > lstart && nlines < 512)
+ {
+ line_starts[nlines] = lstart;
+ line_ends[nlines] = char_pos;
+ nlines++;
+ }
+
+ /* Find the line whose face indicates selection. Track
+ visual line index for Zoom (skip whitespace-only lines
+ like Vertico's leading cursor-space). */
+ int candidate_idx = 0;
+ for (int li = 0; li < nlines; li++)
+ {
+ Lisp_Object face
+ = Fget_text_property (make_fixnum (line_starts[li]),
+ Qface, str);
+ if (ns_ax_face_is_selected (face))
+ {
+ Lisp_Object line
+ = Fsubstring_no_properties (
+ str,
+ make_fixnum (line_starts[li]),
+ make_fixnum (line_ends[li]));
+ NSString *text = [NSString stringWithLispString:line];
+ text = [text stringByTrimmingCharactersInSet:
+ [NSCharacterSet
+ whitespaceAndNewlineCharacterSet]];
+ if ([text length] > 0)
+ {
+ *out_line_index = candidate_idx;
+ return text;
+ }
+ }
+
+ /* Count non-trivial lines as candidates for Zoom. */
+ if (line_ends[li] - line_starts[li] > 1)
+ candidate_idx++;
+ }
+ }
+ }
+
+ return nil;
+}
+
+
+/* Scan buffer text of a child frame for the selected completion
+ candidate. Used for frameworks that render candidates in a
+ child frame (e.g. Corfu, Company-box) rather than as overlay
+ strings. Check the effective face (text properties + overlays)
+ at the start of each line via Fget_char_property.
+
+ Returns the candidate text (trimmed) or nil. Sets
+ *OUT_LINE_INDEX to the 0-based line index for Zoom. */
+static NSString *
+ns_ax_selected_child_frame_text (struct buffer *b, Lisp_Object buf_obj,
+ int *out_line_index)
+{
+ *out_line_index = -1;
+ ptrdiff_t beg = BUF_BEGV (b);
+ ptrdiff_t end = BUF_ZV (b);
+
+ if (beg >= end)
+ return nil;
+
+ /* Temporarily switch to the child frame buffer.
+ Fbuffer_substring_no_properties operates on current_buffer,
+ which may be a different buffer (e.g., the parent frame's). */
+ specpdl_ref count = SPECPDL_INDEX ();
+ record_unwind_current_buffer ();
+ set_buffer_internal_1 (b);
+
+ /* Get buffer text as a Lisp string for efficient scanning.
+ The buffer is a small completion popup (typically < 20 lines). */
+ Lisp_Object str
+ = Fbuffer_substring_no_properties (make_fixnum (beg),
+ make_fixnum (end));
+ if (!STRINGP (str) || SCHARS (str) == 0)
+ {
+ unbind_to (count, Qnil);
+ return nil;
+ }
+
+ /* Scan newlines (same pattern as ns_ax_selected_overlay_text).
+ The data pointer is used only in this loop, before Lisp calls. */
+ const unsigned char *data = SDATA (str);
+ ptrdiff_t byte_len = SBYTES (str);
+ ptrdiff_t line_starts[128];
+ ptrdiff_t line_ends[128];
+ int nlines = 0;
+ ptrdiff_t char_pos = 0, byte_pos = 0, lstart = 0;
+
+ while (byte_pos < byte_len && nlines < 128)
+ {
+ if (data[byte_pos] == '\n')
+ {
+ if (char_pos > lstart)
+ {
+ line_starts[nlines] = lstart;
+ line_ends[nlines] = char_pos;
+ nlines++;
+ }
+ lstart = char_pos + 1;
+ }
+ if (STRING_MULTIBYTE (str))
+ byte_pos += BYTES_BY_CHAR_HEAD (data[byte_pos]);
+ else
+ byte_pos++;
+ char_pos++;
+ }
+ if (char_pos > lstart && nlines < 128)
+ {
+ line_starts[nlines] = lstart;
+ line_ends[nlines] = char_pos;
+ nlines++;
+ }
+
+ /* Find the line with a selected face. Use Fget_char_property on
+ the BUFFER (not the string) so overlay faces are included.
+ Offset string positions by beg to get buffer positions. */
+ for (int li = 0; li < nlines; li++)
+ {
+ ptrdiff_t buf_pos = beg + line_starts[li];
+ Lisp_Object face
+ = Fget_char_property (make_fixnum (buf_pos), Qface, buf_obj);
+
+ if (ns_ax_face_is_selected (face))
+ {
+ Lisp_Object line
+ = Fsubstring_no_properties (str,
+ make_fixnum (line_starts[li]),
+ make_fixnum (line_ends[li]));
+ NSString *text = [NSString stringWithLispString:line];
+ text = [text stringByTrimmingCharactersInSet:
+ [NSCharacterSet
+ whitespaceAndNewlineCharacterSet]];
+ if ([text length] > 0)
+ {
+ *out_line_index = li;
+ unbind_to (count, Qnil);
+ return text;
+ }
+ }
+ }
+
+ unbind_to (count, Qnil);
+ return nil;
+}
+
+
/* Build accessibility text for window W, skipping invisible text.
Populates *OUT_START with the buffer start charpos.
Populates *OUT_RUNS with an array of visible runs and *OUT_NRUNS
@@ -7278,6 +7528,1102 @@ ns_ax_post_notification_with_info (id element,
@end
@@ -268,6 +525,8 @@ index 935919f..e80c3df 100644
+ [cachedInteractiveSpans release];
+ if (visibleRuns)
+ xfree (visibleRuns);
+ if (lineStartOffsets)
+ xfree (lineStartOffsets);
+ [super dealloc];
+}
+
@@ -285,10 +544,65 @@ index 935919f..e80c3df 100644
+ visibleRuns = NULL;
+ }
+ visibleRunCount = 0;
+ if (lineStartOffsets)
+ {
+ xfree (lineStartOffsets);
+ lineStartOffsets = NULL;
+ }
+ lineCount = 0;
+ }
+ [self invalidateInteractiveSpans];
+}
+
+/* ---- Line index helpers ---- */
+
+/* Return the line number for AX string index IDX using the
+ precomputed lineStartOffsets array. Binary search: O(log L)
+ where L is the number of lines in the cached text.
+
+ lineStartOffsets[i] holds the AX string index where line i
+ begins. Built once per cache rebuild in ensureTextCache. */
+- (NSInteger)lineForAXIndex:(NSUInteger)idx
+{
+ @synchronized (self)
+ {
+ if (!lineStartOffsets || lineCount == 0)
+ return 0;
+
+ /* Binary search for the largest line whose start offset <= idx. */
+ NSUInteger lo = 0, hi = lineCount;
+ while (lo < hi)
+ {
+ NSUInteger mid = lo + (hi - lo) / 2;
+ if (lineStartOffsets[mid] <= idx)
+ lo = mid + 1;
+ else
+ hi = mid;
+ }
+ return (NSInteger) (lo > 0 ? lo - 1 : 0);
+ }
+}
+
+/* Return the AX string range for LINE using the precomputed
+ lineStartOffsets array. O(1) lookup. */
+- (NSRange)rangeForLine:(NSUInteger)line textLength:(NSUInteger)tlen
+{
+ @synchronized (self)
+ {
+ if (!lineStartOffsets || lineCount == 0)
+ return NSMakeRange (NSNotFound, 0);
+
+ if (line >= lineCount)
+ return NSMakeRange (NSNotFound, 0);
+
+ NSUInteger start = lineStartOffsets[line];
+ NSUInteger end = (line + 1 < lineCount)
+ ? lineStartOffsets[line + 1]
+ : tlen;
+ return NSMakeRange (start, end - start);
+ }
+}
+
+- (void)ensureTextCache
+{
+ NSTRACE ("EmacsAccessibilityBuffer ensureTextCache");
@@ -340,6 +654,45 @@ index 935919f..e80c3df 100644
+ xfree (visibleRuns);
+ visibleRuns = runs;
+ visibleRunCount = nruns;
+
+ /* Build line-start index for O(log L) line queries.
+ Walk the cached text once, recording the start offset
+ of each line. This runs once per cache rebuild (on text
+ change or narrowing), not per cursor move. */
+ if (lineStartOffsets)
+ xfree (lineStartOffsets);
+ lineStartOffsets = NULL;
+ lineCount = 0;
+
+ NSUInteger tlen = [cachedText length];
+ if (tlen > 0)
+ {
+ NSUInteger cap = 256;
+ lineStartOffsets = xmalloc (cap * sizeof (NSUInteger));
+ lineStartOffsets[0] = 0;
+ lineCount = 1;
+ NSUInteger pos = 0;
+ while (pos < tlen)
+ {
+ NSRange lr = [cachedText lineRangeForRange:
+ NSMakeRange (pos, 0)];
+ NSUInteger next = NSMaxRange (lr);
+ if (next <= pos)
+ break; /* safety */
+ if (next < tlen)
+ {
+ if (lineCount >= cap)
+ {
+ cap *= 2;
+ lineStartOffsets = xrealloc (lineStartOffsets,
+ cap * sizeof (NSUInteger));
+ }
+ lineStartOffsets[lineCount] = next;
+ lineCount++;
+ }
+ pos = next;
+ }
+ }
+ }
+}
+
@@ -807,77 +1160,7 @@ index 935919f..e80c3df 100644
+ if (point_idx > [cachedText length])
+ point_idx = [cachedText length];
+
+ /* Count lines by iterating lineRangeForRange from the start.
+ Each call jumps an entire line — O(lines) not O(chars). */
+ NSInteger line = 0;
+ NSUInteger scan = 0;
+ NSUInteger len = [cachedText length];
+ while (scan < point_idx && scan < len)
+ {
+ NSRange lr = [cachedText lineRangeForRange:NSMakeRange (scan, 0)];
+ NSUInteger next = NSMaxRange (lr);
+ if (next <= scan) break; /* safety */
+ if (next > point_idx) break;
+ line++;
+ scan = next;
+ }
+ return line;
+}
+
+- (NSString *)accessibilityStringForRange:(NSRange)range
+{
+ if (![NSThread isMainThread])
+ {
+ __block NSString *result;
+ dispatch_sync (dispatch_get_main_queue (), ^{
+ result = [self accessibilityStringForRange:range];
+ });
+ return result;
+ }
+ [self ensureTextCache];
+ if (!cachedText || range.location + range.length > [cachedText length])
+ return @"";
+ return [cachedText substringWithRange:range];
+}
+
+- (NSAttributedString *)accessibilityAttributedStringForRange:(NSRange)range
+{
+ NSString *str = [self accessibilityStringForRange:range];
+ return [[[NSAttributedString alloc] initWithString:str] autorelease];
+}
+
+- (NSInteger)accessibilityLineForIndex:(NSInteger)index
+{
+ if (![NSThread isMainThread])
+ {
+ __block NSInteger result;
+ dispatch_sync (dispatch_get_main_queue (), ^{
+ result = [self accessibilityLineForIndex:index];
+ });
+ return result;
+ }
+ [self ensureTextCache];
+ if (!cachedText || index < 0)
+ return 0;
+
+ NSUInteger idx = (NSUInteger) index;
+ if (idx > [cachedText length])
+ idx = [cachedText length];
+
+ /* Count lines by iterating lineRangeForRange — O(lines). */
+ NSInteger line = 0;
+ NSUInteger scan = 0;
+ NSUInteger len = [cachedText length];
+ while (scan < idx && scan < len)
+ {
+ NSRange lr = [cachedText lineRangeForRange:NSMakeRange (scan, 0)];
+ NSUInteger next = NSMaxRange (lr);
+ if (next <= scan) break;
+ if (next > idx) break;
+ line++;
+ scan = next;
+ }
+ return line;
+ return [self lineForAXIndex:idx];
+}
+
+- (NSRange)accessibilityRangeForLine:(NSInteger)line
@@ -899,26 +1182,7 @@ index 935919f..e80c3df 100644
+ return (line == 0) ? NSMakeRange (0, 0)
+ : NSMakeRange (NSNotFound, 0);
+
+ /* Skip to the requested line using lineRangeForRange — O(lines)
+ not O(chars), consistent with accessibilityLineForIndex:. */
+ NSInteger cur_line = 0;
+ NSUInteger scan = 0;
+ while (cur_line < line && scan < len)
+ {
+ NSRange lr = [cachedText lineRangeForRange:NSMakeRange (scan, 0)];
+ NSUInteger next = NSMaxRange (lr);
+ if (next <= scan) break; /* safety */
+ cur_line++;
+ scan = next;
+ }
+ if (cur_line != line)
+ return NSMakeRange (NSNotFound, 0);
+
+ /* Return the range of the target line. */
+ if (scan >= len)
+ return NSMakeRange (len, 0); /* phantom line after final newline */
+ NSRange lr = [cachedText lineRangeForRange:NSMakeRange (scan, 0)];
+ return lr;
+ return [self rangeForLine:(NSUInteger)line textLength:len];
+}
+
+- (NSRange)accessibilityRangeForIndex:(NSInteger)index

8
patches/0003-ns-add-buffer-notification-dispatch-and-mode-line-el.patch
View File

@@ -1,7 +1,7 @@
From 8163e04dbc948ff24633bed534a8c66b9bc1b187 Mon Sep 17 00:00:00 2001
From 97baf7b5f8b0ccc85342e7d552b69b337c98f772 Mon Sep 17 00:00:00 2001
From: Martin Sukany <martin@sukany.cz>
Date: Sat, 28 Feb 2026 12:58:11 +0100
Subject: [PATCH 3/6] ns: add buffer notification dispatch and mode-line
Subject: [PATCH 3/8] ns: add buffer notification dispatch and mode-line
element
Add VoiceOver notification methods and mode-line readout.
@@ -24,10 +24,10 @@ region selection feedback, completion popups, mode-line reading.
1 file changed, 545 insertions(+)
diff --git a/src/nsterm.m b/src/nsterm.m
index e80c3df..d27e4ed 100644
index fc5906a..f1a1b42 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -8379,6 +8379,551 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
@@ -8624,6 +8624,551 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
@end

8
patches/0004-ns-add-interactive-span-elements-for-Tab-navigation.patch
View File

@@ -1,7 +1,7 @@
From 6626fa801e94c693d0027c3d7b02e750def95df9 Mon Sep 17 00:00:00 2001
From 1bd12dd5d464d0c3f9774630014e434b8fb0e19e Mon Sep 17 00:00:00 2001
From: Martin Sukany <martin@sukany.cz>
Date: Sat, 28 Feb 2026 12:58:11 +0100
Subject: [PATCH 4/6] ns: add interactive span elements for Tab navigation
Subject: [PATCH 4/8] ns: add interactive span elements for Tab navigation
* src/nsterm.m (ns_ax_scan_interactive_spans): New function.
(EmacsAccessibilityInteractiveSpan): Implement AXButton/AXLink
@@ -17,10 +17,10 @@ Tested on macOS 14. Verified: Tab-cycling through org-mode links,
1 file changed, 286 insertions(+)
diff --git a/src/nsterm.m b/src/nsterm.m
index d27e4ed..bfa1b26 100644
index f1a1b42..91d0241 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -8924,6 +8924,292 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
@@ -9169,6 +9169,292 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
@end

18
patches/0005-ns-integrate-accessibility-with-EmacsView-and-redisp.patch
View File

@@ -1,7 +1,7 @@
From 72a0b8bad2d200cf093d9e0c60d937032784bd74 Mon Sep 17 00:00:00 2001
From 3bbe8ba29725a4708595befa6b73e5873a2aab43 Mon Sep 17 00:00:00 2001
From: Martin Sukany <martin@sukany.cz>
Date: Sat, 28 Feb 2026 12:58:11 +0100
Subject: [PATCH 5/6] ns: integrate accessibility with EmacsView and redisplay
Subject: [PATCH 5/8] ns: integrate accessibility with EmacsView and redisplay
Wire the accessibility infrastructure into EmacsView and the
redisplay cycle. After this patch, VoiceOver and Zoom are active.
@@ -53,7 +53,7 @@ index 7367e3c..608650e 100644
** Re-introduced dictation, lost in Emacs v30 (macOS).
We lost macOS dictation in v30 when migrating to NSTextInputClient.
diff --git a/src/nsterm.m b/src/nsterm.m
index bfa1b26..1780194 100644
index 91d0241..125e52c 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -1105,6 +1105,11 @@ ns_update_end (struct frame *f)
@@ -112,7 +112,7 @@ index bfa1b26..1780194 100644
ns_focus (f, NULL, 0);
NSGraphicsContext *ctx = [NSGraphicsContext currentContext];
@@ -7293,7 +7335,6 @@ ns_ax_post_notification_with_info (id element,
@@ -7531,7 +7573,6 @@ ns_ax_post_notification_with_info (id element,
@@ -120,7 +120,7 @@ index bfa1b26..1780194 100644
static BOOL
ns_ax_find_completion_overlay_range (struct buffer *b, ptrdiff_t point,
ptrdiff_t *out_start,
@@ -8380,7 +8421,6 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
@@ -8625,7 +8666,6 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
@end
@@ -128,7 +128,7 @@ index bfa1b26..1780194 100644
/* ===================================================================
EmacsAccessibilityBuffer (Notifications) — AX event dispatch
@@ -8925,7 +8965,6 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
@@ -9170,7 +9210,6 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
@end
@@ -136,7 +136,7 @@ index bfa1b26..1780194 100644
/* ===================================================================
EmacsAccessibilityInteractiveSpan — helpers and implementation
=================================================================== */
@@ -9255,6 +9294,7 @@ ns_ax_scan_interactive_spans (struct window *w,
@@ -9500,6 +9539,7 @@ ns_ax_scan_interactive_spans (struct window *w,
[layer release];
#endif
@@ -144,7 +144,7 @@ index bfa1b26..1780194 100644
[[self menu] release];
[super dealloc];
}
@@ -10603,6 +10643,32 @@ ns_in_echo_area (void)
@@ -10848,6 +10888,32 @@ ns_in_echo_area (void)
XSETFRAME (event.frame_or_window, emacsframe);
kbd_buffer_store_event (&event);
ns_send_appdefined (-1); // Kick main loop
@@ -177,7 +177,7 @@ index bfa1b26..1780194 100644
}
@@ -11840,6 +11906,332 @@ ns_in_echo_area (void)
@@ -12085,6 +12151,332 @@ ns_in_echo_area (void)
return fs_state;
}

4
patches/0006-doc-add-VoiceOver-accessibility-section-to-macOS-app.patch
View File

@@ -1,7 +1,7 @@
From 2865a2fccc26e339a4f649b65ab07cf323acf0d1 Mon Sep 17 00:00:00 2001
From 5ddf6227b581bf292fc187a1ebcaf80d2cd4cf2a Mon Sep 17 00:00:00 2001
From: Martin Sukany <martin@sukany.cz>
Date: Sat, 28 Feb 2026 12:58:11 +0100
Subject: [PATCH 6/6] doc: add VoiceOver accessibility section to macOS
Subject: [PATCH 6/8] doc: add VoiceOver accessibility section to macOS
appendix
* doc/emacs/macos.texi (VoiceOver Accessibility): New node. Document

169
patches/0007-ns-announce-overlay-completion-candidates-for-VoiceO.patch
View File

@@ -1,7 +1,7 @@
From 6e907a1000a8b138976d6a906e40449fdf1a61c5 Mon Sep 17 00:00:00 2001
From 8f619411ec75efbd18e663bb3f2ed6f8c9af60d8 Mon Sep 17 00:00:00 2001
From: Martin Sukany <martin@sukany.cz>
Date: Sat, 28 Feb 2026 14:46:25 +0100
Subject: [PATCH 1/2] ns: announce overlay completion candidates for VoiceOver
Subject: [PATCH 7/8] ns: announce overlay completion candidates for VoiceOver
Completion frameworks such as Vertico, Ivy, and Icomplete render
candidates via overlay before-string/after-string properties rather
@@ -52,14 +52,14 @@ Independent overlay branch, BUF_CHARS_MODIFF gating, candidate
announcement with overlay Zoom rect storage.
---
src/nsterm.h | 3 +
src/nsterm.m | 331 +++++++++++++++++++++++++++++++++++++++++++++------
2 files changed, 298 insertions(+), 36 deletions(-)
src/nsterm.m | 361 ++++++++++++++++++++++++++++++++++++++++++++++-----
2 files changed, 329 insertions(+), 35 deletions(-)
diff --git a/src/nsterm.h b/src/nsterm.h
index 51c30ca..5c15639 100644
index 5298386..a007925 100644
--- a/src/nsterm.h
+++ b/src/nsterm.h
@@ -507,6 +507,7 @@ typedef struct ns_ax_visible_run
@@ -509,6 +509,7 @@ typedef struct ns_ax_visible_run
@property (nonatomic, assign) ptrdiff_t cachedOverlayModiff;
@property (nonatomic, assign) ptrdiff_t cachedTextStart;
@property (nonatomic, assign) ptrdiff_t cachedModiff;
@@ -67,7 +67,7 @@ index 51c30ca..5c15639 100644
@property (nonatomic, assign) ptrdiff_t cachedPoint;
@property (nonatomic, assign) BOOL cachedMarkActive;
@property (nonatomic, copy) NSString *cachedCompletionAnnouncement;
@@ -591,6 +592,8 @@ typedef NS_ENUM (NSInteger, EmacsAXSpanType)
@@ -595,6 +596,8 @@ typedef NS_ENUM (NSInteger, EmacsAXSpanType)
BOOL accessibilityUpdating;
@public /* Accessed by ns_draw_phys_cursor (C function). */
NSRect lastAccessibilityCursorRect;
@@ -77,7 +77,7 @@ index 51c30ca..5c15639 100644
BOOL font_panel_active;
NSFont *font_panel_result;
diff --git a/src/nsterm.m b/src/nsterm.m
index 1780194..143e784 100644
index 125e52c..ebd52c6 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -3258,7 +3258,12 @@ ns_draw_window_cursor (struct window *w, struct glyph_row *glyph_row,
@@ -94,9 +94,9 @@ index 1780194..143e784 100644
NSRect screenRect = [[view window] convertRectToScreen:windowRect];
CGRect cgRect = NSRectToCGRect (screenRect);
@@ -6915,11 +6920,156 @@ ns_create_font_panel_buttons (id target, SEL select, SEL cancel_action)
are truncated for accessibility purposes. */
#define NS_AX_TEXT_CAP 100000
@@ -7159,11 +7164,156 @@ ns_ax_selected_child_frame_text (struct buffer *b, Lisp_Object buf_obj,
}
+/* Return true if FACE is or contains a face symbol whose name
+ includes "current" or "selected", indicating a highlighted
@@ -252,7 +252,7 @@ index 1780194..143e784 100644
static NSString *
ns_ax_buffer_text (struct window *w, ptrdiff_t *out_start,
ns_ax_visible_run **out_runs, NSUInteger *out_nruns)
@@ -6996,7 +7146,7 @@ ns_ax_buffer_text (struct window *w, ptrdiff_t *out_start,
@@ -7234,7 +7384,7 @@ ns_ax_buffer_text (struct window *w, ptrdiff_t *out_start,
/* Extract this visible run's text. Use
Fbuffer_substring_no_properties which correctly handles the
@@ -261,7 +261,7 @@ index 1780194..143e784 100644
include garbage bytes when the run spans the gap position. */
Lisp_Object lstr = Fbuffer_substring_no_properties (
make_fixnum (pos), make_fixnum (run_end));
@@ -7077,7 +7227,7 @@ ns_ax_frame_for_range (struct window *w, EmacsView *view,
@@ -7315,7 +7465,7 @@ ns_ax_frame_for_range (struct window *w, EmacsView *view,
return NSZeroRect;
/* charpos_start and charpos_len are already in buffer charpos
@@ -270,7 +270,7 @@ index 1780194..143e784 100644
charposForAccessibilityIndex which handles invisible text. */
ptrdiff_t cp_start = charpos_start;
ptrdiff_t cp_end = cp_start + charpos_len;
@@ -7556,6 +7706,7 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
@@ -7794,6 +7944,7 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
@synthesize cachedOverlayModiff;
@synthesize cachedTextStart;
@synthesize cachedModiff;
@@ -278,7 +278,7 @@ index 1780194..143e784 100644
@synthesize cachedPoint;
@synthesize cachedMarkActive;
@synthesize cachedCompletionAnnouncement;
@@ -7596,7 +7747,7 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
@@ -7891,7 +8042,7 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
NSTRACE ("EmacsAccessibilityBuffer ensureTextCache");
/* This method is only called from the main thread (AX getters
dispatch_sync to main first). Reads of cachedText/cachedTextModiff
@@ -287,7 +287,7 @@ index 1780194..143e784 100644
write section at the end needs synchronization to protect
against concurrent reads from AX server thread. */
eassert ([NSThread isMainThread]);
@@ -7609,16 +7760,15 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
@@ -7904,16 +8055,15 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
return;
ptrdiff_t modiff = BUF_MODIFF (b);
@@ -310,7 +310,7 @@ index 1780194..143e784 100644
&& cachedTextStart == BUF_BEGV (b)
&& pt >= cachedTextStart
&& (textLen == 0
@@ -7635,7 +7785,6 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
@@ -7930,7 +8080,6 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
[cachedText release];
cachedText = [text retain];
cachedTextModiff = modiff;
@@ -318,7 +318,7 @@ index 1780194..143e784 100644
cachedTextStart = start;
if (visibleRuns)
@@ -7661,7 +7810,7 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
@@ -7995,7 +8144,7 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
/* Binary search: runs are sorted by charpos (ascending). Find the
run whose [charpos, charpos+length) range contains the target,
or the nearest run after an invisible gap. O(log n) instead of
@@ -327,7 +327,7 @@ index 1780194..143e784 100644
NSUInteger lo = 0, hi = visibleRunCount;
while (lo < hi)
{
@@ -7674,7 +7823,7 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
@@ -8008,7 +8157,7 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
else
{
/* Found: charpos is inside this run. Compute UTF-16 delta
@@ -336,7 +336,7 @@ index 1780194..143e784 100644
NSUInteger chars_in = (NSUInteger)(charpos - r->charpos);
if (chars_in == 0 || !cachedText)
return r->ax_start;
@@ -7699,10 +7848,10 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
@@ -8033,10 +8182,10 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
/* Convert accessibility string index to buffer charpos.
Safe to call from any thread: uses only cachedText (NSString) and
@@ -349,7 +349,7 @@ index 1780194..143e784 100644
@synchronized (self)
{
if (visibleRunCount == 0)
@@ -7736,7 +7885,7 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
@@ -8070,7 +8219,7 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
return cp;
}
}
@@ -358,7 +358,7 @@ index 1780194..143e784 100644
if (lo > 0)
{
ns_ax_visible_run *last = &visibleRuns[visibleRunCount - 1];
@@ -7758,7 +7907,7 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
@@ -8092,7 +8241,7 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
deadlocking the AX server thread. This is prevented by:
1. validWindow checks WINDOW_LIVE_P and BUFFERP before every
@@ -367,16 +367,59 @@ index 1780194..143e784 100644
2. All dispatch_sync blocks run on the main thread where no
concurrent Lisp code can modify state between checks.
3. block_input prevents timer events and process output from
@@ -8166,7 +8315,7 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
if (idx > [cachedText length])
idx = [cachedText length];
@@ -8443,7 +8592,51 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
if (point_idx > [cachedText length])
point_idx = [cachedText length];
- /* Count lines by iterating lineRangeForRange — O(lines). */
+ /* Count lines by iterating lineRangeForRange --- O(lines). */
NSInteger line = 0;
NSUInteger scan = 0;
NSUInteger len = [cachedText length];
@@ -8422,7 +8571,7 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
+ return [self lineForAXIndex:point_idx];
+}
+
+- (NSString *)accessibilityStringForRange:(NSRange)range
+{
+ if (![NSThread isMainThread])
+ {
+ __block NSString *result;
+ dispatch_sync (dispatch_get_main_queue (), ^{
+ result = [self accessibilityStringForRange:range];
+ });
+ return result;
+ }
+ [self ensureTextCache];
+ if (!cachedText || range.location + range.length > [cachedText length])
+ return @"";
+ return [cachedText substringWithRange:range];
+}
+
+- (NSAttributedString *)accessibilityAttributedStringForRange:(NSRange)range
+{
+ NSString *str = [self accessibilityStringForRange:range];
+ return [[[NSAttributedString alloc] initWithString:str] autorelease];
+}
+
+- (NSInteger)accessibilityLineForIndex:(NSInteger)index
+{
+ if (![NSThread isMainThread])
+ {
+ __block NSInteger result;
+ dispatch_sync (dispatch_get_main_queue (), ^{
+ result = [self accessibilityLineForIndex:index];
+ });
+ return result;
+ }
+ [self ensureTextCache];
+ if (!cachedText || index < 0)
+ return 0;
+
+ NSUInteger idx = (NSUInteger) index;
+ if (idx > [cachedText length])
+ idx = [cachedText length];
+
return [self lineForAXIndex:idx];
+
}
- (NSRange)accessibilityRangeForLine:(NSInteger)line
@@ -8667,7 +8860,7 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
/* ===================================================================
@@ -385,7 +428,7 @@ index 1780194..143e784 100644
These methods notify VoiceOver of text and selection changes.
Called from the redisplay cycle (postAccessibilityUpdates).
@@ -8437,7 +8586,7 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
@@ -8682,7 +8875,7 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
if (point > self.cachedPoint
&& point - self.cachedPoint == 1)
{
@@ -394,7 +437,7 @@ index 1780194..143e784 100644
[self invalidateTextCache];
[self ensureTextCache];
if (cachedText)
@@ -8456,7 +8605,7 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
@@ -8701,7 +8894,7 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
/* Update cachedPoint here so the selection-move branch does NOT
fire for point changes caused by edits. WebKit and Chromium
never send both ValueChanged and SelectedTextChanged for the
@@ -403,34 +446,26 @@ index 1780194..143e784 100644
self.cachedPoint = point;
NSDictionary *change = @{
@@ -8789,16 +8938,126 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
@@ -9034,14 +9227,112 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
BOOL markActive = !NILP (BVAR (b, mark_active));
/* --- Text changed (edit) --- */
+ ptrdiff_t chars_modiff = BUF_CHARS_MODIFF (b);
+ BOOL textDidChange = NO;
if (modiff != self.cachedModiff)
{
self.cachedModiff = modiff;
- [self postTextChangedNotification:point];
+ /* Only post ValueChanged when actual characters changed.
+ Text property changes (e.g. face updates from hl-line-mode,
+ Text property changes (e.g. face updates from
+ vertico--prompt-selection) bump BUF_MODIFF but not
+ BUF_CHARS_MODIFF. Posting ValueChanged for property-only
+ changes causes VoiceOver to say "new line" when the diff
+ is non-empty due to overlay content changes.
+
+ Use textDidChange to avoid blocking the cursor-move branch
+ below: property-only changes must not prevent
+ SelectedTextChanged from firing when point also moved
+ (e.g. hl-line-mode updates face properties on every cursor
+ movement in dired and other read-only buffers). */
+ is non-empty due to overlay content changes. */
+ if (chars_modiff != self.cachedCharsModiff)
+ {
+ self.cachedCharsModiff = chars_modiff;
+ self.emacsView->overlayZoomActive = NO;
+ [self postTextChangedNotification:point];
+ textDidChange = YES;
+ }
+ }
+
@@ -522,19 +557,11 @@ index 1780194..143e784 100644
/* --- Cursor moved or selection changed ---
- Use 'else if' — edits and selection moves are mutually exclusive
- per the WebKit/Chromium pattern. */
- else if (point != self.cachedPoint || markActive != self.cachedMarkActive)
+ Skip when ValueChanged was already posted (edits and selection
+ moves are mutually exclusive per the WebKit/Chromium pattern).
+ But DO fire when only text properties changed (BUF_MODIFF bumped
+ without BUF_CHARS_MODIFF) --- hl-line-mode and similar packages
+ update face properties on every cursor movement. */
+ if (!textDidChange
+ && (point != self.cachedPoint || markActive != self.cachedMarkActive))
+ Use 'else if' --- edits and selection moves are mutually exclusive
per the WebKit/Chromium pattern. */
else if (point != self.cachedPoint || markActive != self.cachedMarkActive)
{
ptrdiff_t oldPoint = self.cachedPoint;
BOOL oldMarkActive = self.cachedMarkActive;
@@ -8966,7 +9225,7 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
@@ -9211,7 +9502,7 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
/* ===================================================================
@@ -543,7 +570,7 @@ index 1780194..143e784 100644
=================================================================== */
/* Scan visible range of window W for interactive spans.
@@ -9157,7 +9416,7 @@ ns_ax_scan_interactive_spans (struct window *w,
@@ -9402,7 +9693,7 @@ ns_ax_scan_interactive_spans (struct window *w,
- (BOOL) isAccessibilityFocused
{
/* Read the cached point stored by EmacsAccessibilityBuffer on the main
@@ -552,7 +579,7 @@ index 1780194..143e784 100644
EmacsAccessibilityBuffer *pb = self.parentBuffer;
if (!pb)
return NO;
@@ -9174,7 +9433,7 @@ ns_ax_scan_interactive_spans (struct window *w,
@@ -9419,7 +9710,7 @@ ns_ax_scan_interactive_spans (struct window *w,
dispatch_async (dispatch_get_main_queue (), ^{
/* lwin is a Lisp_Object captured by value. This is GC-safe
because Lisp_Objects are tagged integers/pointers that
@@ -561,7 +588,7 @@ index 1780194..143e784 100644
Emacs. The WINDOW_LIVE_P check below guards against the
window being deleted between capture and execution. */
if (!WINDOWP (lwin) || NILP (Fwindow_live_p (lwin)))
@@ -9200,7 +9459,7 @@ ns_ax_scan_interactive_spans (struct window *w,
@@ -9445,7 +9736,7 @@ ns_ax_scan_interactive_spans (struct window *w,
@end
@@ -570,7 +597,23 @@ index 1780194..143e784 100644
Methods are kept here (same .m file) so they access the ivars
declared in the @interface ivar block. */
@implementation EmacsAccessibilityBuffer (InteractiveSpans)
@@ -11922,7 +12181,7 @@ ns_ax_collect_windows (Lisp_Object window, EmacsView *view,
@@ -10765,13 +11056,13 @@ ns_in_echo_area (void)
if (old_title == 0)
{
char *t = strdup ([[[self window] title] UTF8String]);
- char *pos = strstr (t, " — ");
+ char *pos = strstr (t, " --- ");
if (pos)
*pos = '\0';
old_title = t;
}
size_title = xmalloc (strlen (old_title) + 40);
- esprintf (size_title, "%s — (%d × %d)", old_title, cols, rows);
+ esprintf (size_title, "%s --- (%d × %d)", old_title, cols, rows);
[window setTitle: [NSString stringWithUTF8String: size_title]];
[window display];
xfree (size_title);
@@ -12167,7 +12458,7 @@ ns_ax_collect_windows (Lisp_Object window, EmacsView *view,
if (WINDOW_LEAF_P (w))
{
@@ -579,7 +622,7 @@ index 1780194..143e784 100644
EmacsAccessibilityBuffer *elem
= [existing objectForKey:[NSValue valueWithPointer:w]];
if (!elem)
@@ -11956,7 +12215,7 @@ ns_ax_collect_windows (Lisp_Object window, EmacsView *view,
@@ -12201,7 +12492,7 @@ ns_ax_collect_windows (Lisp_Object window, EmacsView *view,
}
else
{
@@ -588,7 +631,7 @@ index 1780194..143e784 100644
Lisp_Object child = w->contents;
while (!NILP (child))
{
@@ -12068,7 +12327,7 @@ ns_ax_collect_windows (Lisp_Object window, EmacsView *view,
@@ -12313,7 +12604,7 @@ ns_ax_collect_windows (Lisp_Object window, EmacsView *view,
accessibilityUpdating = YES;
/* Detect window tree change (split, delete, new buffer). Compare
@@ -597,7 +640,7 @@ index 1780194..143e784 100644
Lisp_Object curRoot = FRAME_ROOT_WINDOW (emacsframe);
if (!EQ (curRoot, lastRootWindow))
{
@@ -12077,12 +12336,12 @@ ns_ax_collect_windows (Lisp_Object window, EmacsView *view,
@@ -12322,12 +12613,12 @@ ns_ax_collect_windows (Lisp_Object window, EmacsView *view,
}
/* If tree is stale, rebuild FIRST so we don't iterate freed

95
patches/0008-ns-announce-child-frame-completion-candidates-for-Vo.patch
View File

@@ -1,7 +1,8 @@
From 846e2fa3f856138127bdc7a475e066003cc76904 Mon Sep 17 00:00:00 2001
From d68d1334147a7de273e39cf26c778389faa424ad Mon Sep 17 00:00:00 2001
From: Martin Sukany <martin@sukany.cz>
Date: Sat, 28 Feb 2026 16:01:29 +0100
Subject: [PATCH] ns: announce child frame completion candidates for VoiceOver
Subject: [PATCH 8/8] ns: announce child frame completion candidates for
VoiceOver
Completion frameworks such as Corfu, Company-box, and similar
render candidates in a child frame rather than as overlay strings
@@ -42,14 +43,14 @@ childFrameCompletionActive flag.
refocus parent buffer element when child frame closes.
---
src/nsterm.h | 2 +
src/nsterm.m | 277 ++++++++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 276 insertions(+), 3 deletions(-)
src/nsterm.m | 253 ++++++++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 254 insertions(+), 1 deletion(-)
diff --git a/src/nsterm.h b/src/nsterm.h
index 5c15639..8b34300 100644
index a007925..1a8a84d 100644
--- a/src/nsterm.h
+++ b/src/nsterm.h
@@ -594,6 +594,7 @@ typedef NS_ENUM (NSInteger, EmacsAXSpanType)
@@ -598,6 +598,7 @@ typedef NS_ENUM (NSInteger, EmacsAXSpanType)
NSRect lastAccessibilityCursorRect;
BOOL overlayZoomActive;
NSRect overlayZoomRect;
@@ -57,7 +58,7 @@ index 5c15639..8b34300 100644
#endif
BOOL font_panel_active;
NSFont *font_panel_result;
@@ -657,6 +658,7 @@ typedef NS_ENUM (NSInteger, EmacsAXSpanType)
@@ -661,6 +662,7 @@ typedef NS_ENUM (NSInteger, EmacsAXSpanType)
- (void)rebuildAccessibilityTree;
- (void)invalidateAccessibilityTree;
- (void)postAccessibilityUpdates;
@@ -66,10 +67,10 @@ index 5c15639..8b34300 100644
@end
diff --git a/src/nsterm.m b/src/nsterm.m
index 143e784..37918a4 100644
index ebd52c6..a7025a9 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -7066,6 +7066,110 @@ ns_ax_selected_overlay_text (struct buffer *b,
@@ -7310,6 +7310,110 @@ ns_ax_selected_overlay_text (struct buffer *b,
}
@@ -180,29 +181,11 @@ index 143e784..37918a4 100644
/* Build accessibility text for window W, skipping invisible text.
Populates *OUT_START with the buffer start charpos.
Populates *OUT_RUNS with an array of visible runs and *OUT_NRUNS
@@ -12311,6 +12415,120 @@ ns_ax_collect_windows (Lisp_Object window, EmacsView *view,
@@ -12588,6 +12692,105 @@ ns_ax_collect_windows (Lisp_Object window, EmacsView *view,
The existing elements carry cached state (modiff, point) from the
previous redisplay cycle. Rebuilding first would create fresh
elements with current values, making change detection impossible. */
+
+/* Child frame completion dedup state. File-scope so that
+ lastChildFrameBuffer can be staticpro'd against GC. */
+static Lisp_Object lastChildFrameBuffer;
+static EMACS_INT lastChildFrameModiff;
+static char *lastChildFrameCandidate;
+
+/* Reset the re-entrance guard when unwinding past
+ postAccessibilityUpdates due to a Lisp signal (longjmp).
+ Without this, a signal during Lisp calls (e.g. Fget_char_property
+ in overlay or child frame scanning) would leave
+ accessibilityUpdating = YES permanently, suppressing all future
+ accessibility notifications. */
+static void
+ns_ax_reset_accessibility_updating (void *view)
+{
+ ((EmacsView *)view)->accessibilityUpdating = NO;
+}
+
+/* Announce the selected candidate in a child frame completion popup.
+ Handles Corfu, Company-box, and similar frameworks that render
+ candidates in a separate child frame rather than as overlay strings
@@ -211,6 +194,10 @@ index 143e784..37918a4 100644
+ after the parent's draw_window_cursor. */
+- (void)announceChildFrameCompletion
+{
+ static char *lastCandidate;
+ static struct buffer *lastBuffer;
+ static EMACS_INT lastModiff;
+
+ /* Validate frame state --- child frames may be partially
+ initialized during creation. */
+ if (!WINDOWP (emacsframe->selected_window))
@@ -225,11 +212,10 @@ index 143e784..37918a4 100644
+ also guards against re-entrance: if Lisp calls below
+ trigger redisplay, the modiff check short-circuits. */
+ EMACS_INT modiff = BUF_MODIFF (b);
+ if (EQ (w->contents, lastChildFrameBuffer)
+ && modiff == lastChildFrameModiff)
+ if (b == lastBuffer && modiff == lastModiff)
+ return;
+ lastChildFrameBuffer = w->contents;
+ lastChildFrameModiff = modiff;
+ lastBuffer = b;
+ lastModiff = modiff;
+
+ /* Skip buffers larger than a typical completion popup.
+ This avoids scanning eldoc, which-key, or other child
@@ -246,10 +232,10 @@ index 143e784..37918a4 100644
+
+ /* Deduplicate --- avoid re-announcing the same candidate. */
+ const char *cstr = [candidate UTF8String];
+ if (lastChildFrameCandidate && strcmp (cstr, lastChildFrameCandidate) == 0)
+ if (lastCandidate && strcmp (cstr, lastCandidate) == 0)
+ return;
+ xfree (lastChildFrameCandidate);
+ lastChildFrameCandidate = xstrdup (cstr);
+ xfree (lastCandidate);
+ lastCandidate = xstrdup (cstr);
+
+ NSDictionary *annInfo = @{
+ NSAccessibilityAnnouncementKey: candidate,
@@ -301,7 +287,7 @@ index 143e784..37918a4 100644
- (void)postAccessibilityUpdates
{
NSTRACE ("[EmacsView postAccessibilityUpdates]");
@@ -12321,10 +12539,60 @@ ns_ax_collect_windows (Lisp_Object window, EmacsView *view,
@@ -12598,11 +12801,59 @@ ns_ax_collect_windows (Lisp_Object window, EmacsView *view,
/* Re-entrance guard: VoiceOver callbacks during notification posting
can trigger redisplay, which calls ns_update_end, which calls us
@@ -312,16 +298,14 @@ index 143e784..37918a4 100644
if (accessibilityUpdating)
return;
accessibilityUpdating = YES;
+ specpdl_ref axCount = SPECPDL_INDEX ();
+ record_unwind_protect_ptr (ns_ax_reset_accessibility_updating, self);
+
+ /* Child frame completion popup (Corfu, Company-box, etc.).
+ Child frames don't participate in the accessibility tree;
+ announce the selected candidate directly. */
+ if (FRAME_PARENT_FRAME (emacsframe))
+ {
+ [self announceChildFrameCompletion];
+ unbind_to (axCount, Qnil);
+ accessibilityUpdating = NO;
+ return;
+ }
+
@@ -360,37 +344,10 @@ index 143e784..37918a4 100644
+ NSAccessibilityFocusedUIElementChangedNotification);
+ }
+ }
+
/* Detect window tree change (split, delete, new buffer). Compare
FRAME_ROOT_WINDOW --- if it changed, the tree structure changed. */
@@ -12355,7 +12623,7 @@ ns_ax_collect_windows (Lisp_Object window, EmacsView *view,
NSAccessibilityFocusedUIElementChangedNotification);
lastSelectedWindow = emacsframe->selected_window;
- accessibilityUpdating = NO;
+ unbind_to (axCount, Qnil);
return;
}
@@ -12399,7 +12667,7 @@ ns_ax_collect_windows (Lisp_Object window, EmacsView *view,
NSAccessibilityFocusedUIElementChangedNotification);
}
- accessibilityUpdating = NO;
+ unbind_to (axCount, Qnil);
}
/* ---- Cursor position for Zoom (via accessibilityBoundsForRange:) ----
@@ -14341,6 +14609,9 @@ syms_of_nsterm (void)
DEFSYM (Qns_ax_completion, "completion");
DEFSYM (Qns_ax_completions_highlight, "completions-highlight");
DEFSYM (Qns_ax_backtab, "backtab");
+
+ lastChildFrameBuffer = Qnil;
+ staticpro (&lastChildFrameBuffer);
/* Qmouse_face and Qkeymap are defined in textprop.c / keymap.c. */
Fput (Qalt, Qmodifier_value, make_fixnum (alt_modifier));
Fput (Qhyper, Qmodifier_value, make_fixnum (hyper_modifier));
Lisp_Object curRoot = FRAME_ROOT_WINDOW (emacsframe);
--
2.43.0

266
patches/0009-ns-fix-O-n-line-scanning-in-accessibility.patch
View File

@@ -1,266 +0,0 @@
From 8dc935c6d88c129dcf4394c0ef4dc070ffc9aac8 Mon Sep 17 00:00:00 2001
From: Martin Sukany <martin@sukany.cz>
Date: Sat, 28 Feb 2026 21:15:04 +0100
Subject: [PATCH] =?UTF-8?q?ns:=20fix=20O(n)=20line=20scanning=20in=20acces?=
=?UTF-8?q?sibility=20=E2=80=94=20use=20precomputed=20line=20index?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
accessibilityLineForIndex: and accessibilityRangeForLine: scanned
from position 0 using lineRangeForRange: in a loop, making them
O(L) where L is the line number. At line 50,000 this caused
VoiceOver to stall (~150,000 iterations per cursor move via
postFocusedCursorNotification: which calls these 3 times).
Build a precomputed lineStartOffsets array in ensureTextCache,
populated once per cache rebuild (O(L) amortized). Line queries
now use binary search: O(log L).
* src/nsterm.h (EmacsAccessibilityBuffer): Add lineStartOffsets
and lineCount ivars. Add lineForAXIndex: and
rangeForLine:textLength: method declarations.
* src/nsterm.m (lineForAXIndex:): New method. Binary search
over lineStartOffsets for O(log L) line lookup.
(rangeForLine:textLength:): New method. O(1) range lookup
using lineStartOffsets.
(ensureTextCache): Build lineStartOffsets after setting
cachedText.
(invalidateTextCache): Free lineStartOffsets.
(dealloc): Free lineStartOffsets.
(accessibilityInsertionPointLineNumber): Delegate to
lineForAXIndex: instead of linear scan.
(accessibilityLineForIndex:): Likewise.
(accessibilityRangeForLine:): Delegate to rangeForLine:textLength:
instead of linear scan.
Performance: cursor movement at line 50,000 goes from ~150,000
iterations to ~51 (3 × log2(50000) ≈ 3 × 17).
---
src/nsterm.h | 4 ++
src/nsterm.m | 148 ++++++++++++++++++++++++++++++++++-----------------
2 files changed, 103 insertions(+), 49 deletions(-)
diff --git a/src/nsterm.h b/src/nsterm.h
index 8b34300..1a8a84d 100644
--- a/src/nsterm.h
+++ b/src/nsterm.h
@@ -499,6 +499,8 @@ typedef struct ns_ax_visible_run
{
ns_ax_visible_run *visibleRuns;
NSUInteger visibleRunCount;
+ NSUInteger *lineStartOffsets; /* AX string index of each line start. */
+ NSUInteger lineCount; /* Number of entries in lineStartOffsets. */
NSMutableArray *cachedInteractiveSpans;
BOOL interactiveSpansDirty;
}
@@ -515,6 +517,8 @@ typedef struct ns_ax_visible_run
@property (nonatomic, assign) ptrdiff_t cachedCompletionOverlayEnd;
@property (nonatomic, assign) ptrdiff_t cachedCompletionPoint;
- (void)invalidateTextCache;
+- (NSInteger)lineForAXIndex:(NSUInteger)idx;
+- (NSRange)rangeForLine:(NSUInteger)line textLength:(NSUInteger)tlen;
- (ptrdiff_t)charposForAccessibilityIndex:(NSUInteger)ax_idx;
- (NSUInteger)accessibilityIndexForCharpos:(ptrdiff_t)charpos;
@end
diff --git a/src/nsterm.m b/src/nsterm.m
index 2e7d776..057ebe7 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -7825,6 +7825,8 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
[cachedInteractiveSpans release];
if (visibleRuns)
xfree (visibleRuns);
+ if (lineStartOffsets)
+ xfree (lineStartOffsets);
[super dealloc];
}
@@ -7842,10 +7844,65 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
visibleRuns = NULL;
}
visibleRunCount = 0;
+ if (lineStartOffsets)
+ {
+ xfree (lineStartOffsets);
+ lineStartOffsets = NULL;
+ }
+ lineCount = 0;
}
[self invalidateInteractiveSpans];
}
+/* ---- Line index helpers ---- */
+
+/* Return the line number for AX string index IDX using the
+ precomputed lineStartOffsets array. Binary search: O(log L)
+ where L is the number of lines in the cached text.
+
+ lineStartOffsets[i] holds the AX string index where line i
+ begins. Built once per cache rebuild in ensureTextCache. */
+- (NSInteger)lineForAXIndex:(NSUInteger)idx
+{
+ @synchronized (self)
+ {
+ if (!lineStartOffsets || lineCount == 0)
+ return 0;
+
+ /* Binary search for the largest line whose start offset <= idx. */
+ NSUInteger lo = 0, hi = lineCount;
+ while (lo < hi)
+ {
+ NSUInteger mid = lo + (hi - lo) / 2;
+ if (lineStartOffsets[mid] <= idx)
+ lo = mid + 1;
+ else
+ hi = mid;
+ }
+ return (NSInteger) (lo > 0 ? lo - 1 : 0);
+ }
+}
+
+/* Return the AX string range for LINE using the precomputed
+ lineStartOffsets array. O(1) lookup. */
+- (NSRange)rangeForLine:(NSUInteger)line textLength:(NSUInteger)tlen
+{
+ @synchronized (self)
+ {
+ if (!lineStartOffsets || lineCount == 0)
+ return NSMakeRange (NSNotFound, 0);
+
+ if (line >= lineCount)
+ return NSMakeRange (NSNotFound, 0);
+
+ NSUInteger start = lineStartOffsets[line];
+ NSUInteger end = (line + 1 < lineCount)
+ ? lineStartOffsets[line + 1]
+ : tlen;
+ return NSMakeRange (start, end - start);
+ }
+}
+
- (void)ensureTextCache
{
NSTRACE ("EmacsAccessibilityBuffer ensureTextCache");
@@ -7895,6 +7952,45 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
xfree (visibleRuns);
visibleRuns = runs;
visibleRunCount = nruns;
+
+ /* Build line-start index for O(log L) line queries.
+ Walk the cached text once, recording the start offset
+ of each line. This runs once per cache rebuild (on text
+ change or narrowing), not per cursor move. */
+ if (lineStartOffsets)
+ xfree (lineStartOffsets);
+ lineStartOffsets = NULL;
+ lineCount = 0;
+
+ NSUInteger tlen = [cachedText length];
+ if (tlen > 0)
+ {
+ NSUInteger cap = 256;
+ lineStartOffsets = xmalloc (cap * sizeof (NSUInteger));
+ lineStartOffsets[0] = 0;
+ lineCount = 1;
+ NSUInteger pos = 0;
+ while (pos < tlen)
+ {
+ NSRange lr = [cachedText lineRangeForRange:
+ NSMakeRange (pos, 0)];
+ NSUInteger next = NSMaxRange (lr);
+ if (next <= pos)
+ break; /* safety */
+ if (next < tlen)
+ {
+ if (lineCount >= cap)
+ {
+ cap *= 2;
+ lineStartOffsets = xrealloc (lineStartOffsets,
+ cap * sizeof (NSUInteger));
+ }
+ lineStartOffsets[lineCount] = next;
+ lineCount++;
+ }
+ pos = next;
+ }
+ }
}
}
@@ -8362,21 +8458,7 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
if (point_idx > [cachedText length])
point_idx = [cachedText length];
- /* Count lines by iterating lineRangeForRange from the start.
- Each call jumps an entire line — O(lines) not O(chars). */
- NSInteger line = 0;
- NSUInteger scan = 0;
- NSUInteger len = [cachedText length];
- while (scan < point_idx && scan < len)
- {
- NSRange lr = [cachedText lineRangeForRange:NSMakeRange (scan, 0)];
- NSUInteger next = NSMaxRange (lr);
- if (next <= scan) break; /* safety */
- if (next > point_idx) break;
- line++;
- scan = next;
- }
- return line;
+ return [self lineForAXIndex:point_idx];
}
- (NSString *)accessibilityStringForRange:(NSRange)range
@@ -8419,20 +8501,7 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
if (idx > [cachedText length])
idx = [cachedText length];
- /* Count lines by iterating lineRangeForRange --- O(lines). */
- NSInteger line = 0;
- NSUInteger scan = 0;
- NSUInteger len = [cachedText length];
- while (scan < idx && scan < len)
- {
- NSRange lr = [cachedText lineRangeForRange:NSMakeRange (scan, 0)];
- NSUInteger next = NSMaxRange (lr);
- if (next <= scan) break;
- if (next > idx) break;
- line++;
- scan = next;
- }
- return line;
+ return [self lineForAXIndex:idx];
}
- (NSRange)accessibilityRangeForLine:(NSInteger)line
@@ -8454,26 +8523,7 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
return (line == 0) ? NSMakeRange (0, 0)
: NSMakeRange (NSNotFound, 0);
- /* Skip to the requested line using lineRangeForRange — O(lines)
- not O(chars), consistent with accessibilityLineForIndex:. */
- NSInteger cur_line = 0;
- NSUInteger scan = 0;
- while (cur_line < line && scan < len)
- {
- NSRange lr = [cachedText lineRangeForRange:NSMakeRange (scan, 0)];
- NSUInteger next = NSMaxRange (lr);
- if (next <= scan) break; /* safety */
- cur_line++;
- scan = next;
- }
- if (cur_line != line)
- return NSMakeRange (NSNotFound, 0);
-
- /* Return the range of the target line. */
- if (scan >= len)
- return NSMakeRange (len, 0); /* phantom line after final newline */
- NSRange lr = [cachedText lineRangeForRange:NSMakeRange (scan, 0)];
- return lr;
+ return [self rangeForLine:(NSUInteger)line textLength:len];
}
- (NSRange)accessibilityRangeForIndex:(NSInteger)index
--
2.43.0

22
patches/README.txt
View File

@@ -326,9 +326,12 @@ TEXT CACHE AND VISIBLE RUNS
narrowing/widening is detected by comparing cachedTextStart
against BUF_BEGV — these operations change the visible region
without bumping either modiff counter. The cache is also
invalidated when the window tree is rebuilt. NS_AX_TEXT_CAP = 100,000
UTF-16 units (~200 KB) caps total exposure; buffers larger than
~50,000 lines are truncated for accessibility purposes.
invalidated when the window tree is rebuilt.
There is no character cap on the accessibility text. The entire
visible (non-invisible) buffer content is exposed to VoiceOver.
Users who do not need accessibility can set ns-accessibility-enabled
to nil for zero overhead.
A lineStartOffsets array is built during each cache rebuild,
recording the AX string index where each line begins. This
@@ -651,14 +654,9 @@ KNOWN LIMITATIONS
produce incomplete or garbled accessibility text.
- Line counting (accessibilityInsertionPointLineNumber,
accessibilityLineForIndex:) was O(lines) in patches 1-5.
Patch 0009 adds a precomputed lineStartOffsets array built
once per cache rebuild; queries are now O(log L) via binary
search.
- Buffers larger than NS_AX_TEXT_CAP (100,000 UTF-16 units) are
truncated. The truncation is silent; AT tools navigating past the
truncation boundary may behave unexpectedly.
accessibilityLineForIndex:) uses a precomputed lineStartOffsets
array built once per cache rebuild. Queries are O(log L) via
binary search.
- No multi-frame coordination. EmacsView.accessibilityElements is
per-view; there is no cross-frame notification ordering.
@@ -752,7 +750,7 @@ TESTING CHECKLIST
*Completions*, Tab to a candidate, Enter to execute, then
C-x o to switch windows. Emacs must not hang.
Stress test (patch 0009 line index):
Stress test (line index):
25. Open a large file (>50,000 lines). Navigate to the end with
M-> or C-v repeatedly. VoiceOver speech should remain fluid
at all positions (no progressive slowdown).