patches: fix Zoom, j/k line-read, fold/unfold, C-n/C-p (regression fixes)

Four regressions introduced during review-based refactoring:

1. ZOOM FOCUS JUMPING (P0008 fix in P0000 scope):
   ns_accessibility_enabled guard was added to ns_zoom_track_completion,
   ns_update_end fallback, and ns_draw_window_cursor.  Zoom works
   independently of VoiceOver; ns_accessibility_enabled is only set when
   a screen reader (VoiceOver) activates the AT layer.  Users who use
   Zoom without VoiceOver got no cursor tracking at all.
   Fix: remove ns_accessibility_enabled from all three Zoom call sites;
   guard only with ns_zoom_enabled_p() as in the original.

2. j/k (ANY SINGLE-STEP LINE COMMAND) READS ONLY FIRST WORD:
   The code only treated C-n/C-p (isCtrlNP) as sequential line moves.
   All other line-movement commands (evil j/k, outline-next-heading,
   org-next-visible-heading, etc.) were classified as 'discontiguous'
   jumps, causing VoiceOver to re-anchor and read only a word.
   Fix: detect single-step moves structurally via NSString line-range
   adjacency (NSMaxRange(oldLine) == newLine.location for forward,
   NSMaxRange(newLine) == oldLine.location for backward).  Any command
   that moves exactly one line is sequential --- no command-name
   whitelisting needed, no package-specific code.

3. ORG FOLD/UNFOLD NOT REFRESHING VOICEOVER (P0007):
   BUF_CHARS_MODIFF misses text-property changes such as 'invisible
   used by org-fold-core (org >= 29), outline-mode, hideshow-mode.
   Fix: use BUF_MODIFF; cost is acceptable (rebuild only on VoiceOver
   queries at human interaction speed, not at redisplay speed).

4. C-n/C-p DROPPED LINE-READ (P0005):
   FocusedUIElementChanged posted for ALL emacsMovedCursor moves raced
   with AXSelectedTextChanged(granularity=line) and caused VoiceOver
   to drop the line-read.  Fix: skip FocusedUIElementChanged for
   sequential moves (isCtrlNP or singleLineMove).

patches/0000-ns-integrate-with-macOS-Zoom-for-cursor-tracking.patch

@@ -1,4 +1,4 @@
-From 2d2b7eb2b3039f3e581460c874a5ece52ebfdb9a Mon Sep 17 00:00:00 2001
+From 95f998ecdda8342da491c57cd62c610cd3c15a3e Mon Sep 17 00:00:00 2001
 From: Martin Sukany <martin@sukany.cz>
 Date: Sat, 28 Feb 2026 22:39:35 +0100
 Subject: [PATCH 0/8] ns: integrate with macOS Zoom for cursor tracking

patches/0001-ns-add-accessibility-base-classes-and-text-extractio.patch

@@ -1,4 +1,4 @@
-From 01f32063667eb000b95b1514b0f78056aaa53c28 Mon Sep 17 00:00:00 2001
+From 1465c5f3ad2ddec5a89329de34d871207626b078 Mon Sep 17 00:00:00 2001
 From: Martin Sukany <martin@sukany.cz>
 Date: Sat, 28 Feb 2026 12:58:11 +0100
 Subject: [PATCH 1/8] ns: add accessibility base classes and text extraction

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

@@ -1,4 +1,4 @@
-From 4f4fa019e14e1cd9283b09b9b7cf20e772edc809 Mon Sep 17 00:00:00 2001
+From d8fb143c071a55e9463282b8017643a3b1159dde Mon Sep 17 00:00:00 2001
 From: Martin Sukany <martin@sukany.cz>
 Date: Sat, 28 Feb 2026 12:58:11 +0100
 Subject: [PATCH 2/8] ns: implement buffer accessibility element (core

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

@@ -1,4 +1,4 @@
-From 4a77386e8210b2ad8fe1c9a0145cbde96d282c7c Mon Sep 17 00:00:00 2001
+From a4f0ba874e18fc5b59ab92f38122461223e916f6 Mon Sep 17 00:00:00 2001
 From: Martin Sukany <martin@sukany.cz>
 Date: Sat, 28 Feb 2026 12:58:11 +0100
 Subject: [PATCH 3/8] ns: add buffer notification dispatch and mode-line

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

@@ -1,4 +1,4 @@
-From f6a4baf7e19aa2b95becff1dc8be4c2fdc85a0d5 Mon Sep 17 00:00:00 2001
+From de1a3e8c2cbc4e90d3d9f24378fa00716e1ee175 Mon Sep 17 00:00:00 2001
 From: Martin Sukany <martin@sukany.cz>
 Date: Sat, 28 Feb 2026 12:58:11 +0100
 Subject: [PATCH 4/8] ns: add interactive span elements for Tab navigation

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

@@ -1,4 +1,4 @@
-From 825798ddb922cb24cf3db72d76c6ea4e29596844 Mon Sep 17 00:00:00 2001
+From da937d7af5f787c2bf594457ec494a838bd64afc Mon Sep 17 00:00:00 2001
 From: Martin Sukany <martin@sukany.cz>
 Date: Sat, 28 Feb 2026 12:58:11 +0100
 Subject: [PATCH 5/8] ns: integrate accessibility with EmacsView and redisplay

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

@@ -1,4 +1,4 @@
-From b0a0cf378168cd15d2af663100dae87ded394801 Mon Sep 17 00:00:00 2001
+From 4f7f340b5e3e2068b9d20e9fe81f6d0cc20a1340 Mon Sep 17 00:00:00 2001
 From: Martin Sukany <martin@sukany.cz>
 Date: Sat, 28 Feb 2026 12:58:11 +0100
 Subject: [PATCH 6/8] doc: add VoiceOver accessibility section to macOS

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

@@ -1,4 +1,4 @@
-From 1a3dea1876ecde2e625d3a2b8f41d688568ecbf8 Mon Sep 17 00:00:00 2001
+From b90379446166af5f851f6994aff68e242b8d2dca Mon Sep 17 00:00:00 2001
 From: Daneel <daneel@sukany.cz>
 Date: Mon, 2 Mar 2026 18:39:46 +0100
 Subject: [PATCH 7/8] ns: announce overlay completion candidates for VoiceOver

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

@@ -1,4 +1,4 @@
-From f26d6d8d2a9030af3296902b4e3db79fef3ed760 Mon Sep 17 00:00:00 2001
+From 614cc39167cfb89a0ee7731b6b8c012ff838f8dc Mon Sep 17 00:00:00 2001
 From: Daneel <daneel@sukany.cz>
 Date: Mon, 2 Mar 2026 18:49:13 +0100
 Subject: [PATCH 8/8] ns: announce child frame completion candidates for
@@ -33,8 +33,8 @@ area announcements.
  doc/emacs/macos.texi |  14 +-
  etc/NEWS             |  18 +-
  src/nsterm.h         |  20 ++
- src/nsterm.m         | 436 ++++++++++++++++++++++++++++++++++++++++---
+ src/nsterm.m         | 496 ++++++++++++++++++++++++++++++++++++++-----
- 4 files changed, 446 insertions(+), 42 deletions(-)
+ 4 files changed, 479 insertions(+), 69 deletions(-)
 
 diff --git a/doc/emacs/macos.texi b/doc/emacs/macos.texi
 index 8d4a7825d8..03a657f970 100644
@@ -149,7 +149,7 @@ index 21a93bc799..bdd40b8eb7 100644
  @end
  
 diff --git a/src/nsterm.m b/src/nsterm.m
-index 8f744d1bf3..b434a7fd41 100644
+index 8f744d1bf3..3533eca3bc 100644
 --- a/src/nsterm.m
 +++ b/src/nsterm.m
 @@ -1126,24 +1126,19 @@ Uses CFAbsoluteTimeGetCurrent() (~5 ns, a VDSO read) for timing.  */
@@ -187,6 +187,33 @@ index 8f744d1bf3..b434a7fd41 100644
  }
  
  /* Scan overlay before-string / after-string properties in the
+@@ -1275,7 +1270,7 @@ If a completion candidate is selected (overlay or child frame),
+ static void
+ ns_zoom_track_completion (struct frame *f, EmacsView *view)
+ {
+-  if (!ns_accessibility_enabled || !ns_zoom_enabled_p ())
++  if (!ns_zoom_enabled_p ())
+     return;
+   if (!WINDOWP (f->selected_window))
+     return;
+@@ -1393,7 +1388,7 @@ so the visual offset is (ov_line + 1) * line_h from
+      (zoomCursorUpdated is NO).  */
+ #if defined (MAC_OS_X_VERSION_MIN_REQUIRED) \
+     && MAC_OS_X_VERSION_MIN_REQUIRED >= 101000
+-  if (ns_accessibility_enabled && view && !view->zoomCursorUpdated
++  if (view && !view->zoomCursorUpdated
+       && ns_zoom_enabled_p ()
+       && !NSIsEmptyRect (view->lastCursorRect))
+     {
+@@ -3571,7 +3566,7 @@ EmacsView pixels (AppKit, flipped, top-left origin)
+ 
+ #if defined (MAC_OS_X_VERSION_MIN_REQUIRED) \
+     && MAC_OS_X_VERSION_MIN_REQUIRED >= 101000
+-	if (ns_accessibility_enabled && ns_zoom_enabled_p ())
++	if (ns_zoom_enabled_p ())
+ 	  {
+ 	    NSRect windowRect = [view convertRect:r toView:nil];
+ 	    NSRect screenRect
 @@ -7407,6 +7402,112 @@ visual line index for Zoom (skip whitespace-only lines
  
    return nil;
@@ -453,7 +480,72 @@ index 8f744d1bf3..b434a7fd41 100644
        NSInteger direction = ns_ax_text_selection_direction_discontiguous;
        if (point > oldPoint)
  	direction = ns_ax_text_selection_direction_next;
-@@ -9734,6 +9894,13 @@ - (NSRect)accessibilityFrame
+@@ -9548,34 +9708,40 @@ frameworks like Vertico bump BOTH BUF_MODIFF (via text property
+ 	  granularity = ns_ax_text_selection_granularity_line;
+ 	}
+ 
+-      /* Programmatic jumps that cross a line boundary (]], [[, M-<,
+-	 xref, imenu, …) are discontiguous: the cursor teleported to an
+-	 arbitrary position, not one sequential step forward/backward.
+-	 Reporting AXTextSelectionDirectionDiscontiguous causes VoiceOver
+-	 to re-anchor its rotor browse cursor at the new
+-	 accessibilitySelectedTextRange rather than advancing linearly
+-	 from its previous internal position.  */
+-      if (!isCtrlNP && granularity == ns_ax_text_selection_granularity_line)
++      /* Detect whether this is a single adjacent-line move.
++	 Any command that steps exactly one line forward or backward
++	 --- including C-n/C-p, evil j/k, outline-next-heading, etc. ---
++	 is treated as sequential so VoiceOver reads the full destination
++	 line.  Multi-line teleports (]], M-<, xref, imenu, isearch, ...) are
++	 discontiguous so VoiceOver re-anchors its browse cursor.
++	 Adjacency is detected structurally (NSString line ranges), not
++	 by command name, so no package-specific code is needed.  */
++      BOOL singleLineMove = NO;
++      if (!isCtrlNP
++	  && granularity == ns_ax_text_selection_granularity_line
++	  && cachedText)
++	{
++	  BOOL adjFwd = (newLine.location == NSMaxRange (oldLine));
++	  BOOL adjBwd = (NSMaxRange (newLine) == oldLine.location);
++	  singleLineMove = adjFwd || adjBwd;
++	}
++
++      /* Multi-line teleports are discontiguous; single adjacent-line
++	 steps stay sequential.  */
++      if (!isCtrlNP && !singleLineMove
++	  && granularity == ns_ax_text_selection_granularity_line)
+ 	direction = ns_ax_text_selection_direction_discontiguous;
+ 
+-      /* If Emacs moved the cursor (not VoiceOver), force discontiguous
+-	 so VoiceOver re-anchors its browse cursor to the current
+-	 accessibilitySelectedTextRange.  This covers all Emacs-initiated
+-	 moves: editing commands, ELisp, isearch, etc.
+-	 Exception: C-n/C-p (isCtrlNP) already uses next/previous with
+-	 line granularity; those are already sequential and VoiceOver
+-	 handles them correctly.  */
+-      if (emacsMovedCursor && !isCtrlNP)
++      /* Emacs-initiated teleports need re-anchor; sequential steps
++	 (C-n/C-p or any adjacent-line command) do not.  */
++      if (emacsMovedCursor && !isCtrlNP && !singleLineMove)
+ 	direction = ns_ax_text_selection_direction_discontiguous;
+ 
+-      /* Re-anchor VoiceOver's browse cursor for discontiguous (teleport)
+-	 moves only.  For sequential C-n/C-p (isCtrlNP), posting
+-	 FocusedUIElementChanged on the window races with the
+-	 AXSelectedTextChanged(granularity=line) notification and
+-	 causes VoiceOver to drop the line-read speech.  Sequential
+-	 moves are already handled correctly by AXSelectedTextChanged
+-	 with direction=next/previous + granularity=line.  */
+-      if (emacsMovedCursor && !isCtrlNP && [self isAccessibilityFocused])
++      /* FocusedUIElementChanged only for teleports: posting it for
++	 sequential moves races with AXSelectedTextChanged(granularity=line)
++	 and causes VoiceOver to drop the line-read speech.  */
++      if (emacsMovedCursor && !isCtrlNP && !singleLineMove
++	  && [self isAccessibilityFocused])
+ 	{
+ 	  NSWindow *win = [self.emacsView window];
+ 	  if (win)
+@@ -9734,6 +9900,13 @@ - (NSRect)accessibilityFrame
    if (vis_start >= vis_end)
      return @[];
  
@@ -467,7 +559,7 @@ index 8f744d1bf3..b434a7fd41 100644
    block_input ();
    specpdl_ref blk_count = SPECPDL_INDEX ();
    record_unwind_protect_void (unblock_input);
-@@ -9858,6 +10025,7 @@ than O(chars).  Fall back to pos+1 as safety net.  */
+@@ -9858,6 +10031,7 @@ than O(chars).  Fall back to pos+1 as safety net.  */
        pos = span_end;
      }
  
@@ -475,7 +567,7 @@ index 8f744d1bf3..b434a7fd41 100644
    return [[spans copy] autorelease];
  }
  
-@@ -10039,6 +10207,10 @@ - (void)dealloc
+@@ -10039,6 +10213,10 @@ - (void)dealloc
  #endif
  
    [accessibilityElements release];
@@ -486,7 +578,7 @@ index 8f744d1bf3..b434a7fd41 100644
    [[self menu] release];
    [super dealloc];
  }
-@@ -11488,6 +11660,9 @@ - (instancetype) initFrameFromEmacs: (struct frame *)f
+@@ -11488,6 +11666,9 @@ - (instancetype) initFrameFromEmacs: (struct frame *)f
  
    windowClosing = NO;
    processingCompose = NO;
@@ -496,7 +588,7 @@ index 8f744d1bf3..b434a7fd41 100644
    scrollbarsNeedingUpdate = 0;
    fs_state = FULLSCREEN_NONE;
    fs_before_fs = next_maximized = -1;
-@@ -12796,6 +12971,154 @@ - (id)accessibilityFocusedUIElement
+@@ -12796,6 +12977,154 @@ - (id)accessibilityFocusedUIElement
     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.  */
@@ -651,7 +743,7 @@ index 8f744d1bf3..b434a7fd41 100644
  - (void)postAccessibilityUpdates
  {
    NSTRACE ("[EmacsView postAccessibilityUpdates]");
-@@ -12806,11 +13129,64 @@ - (void)postAccessibilityUpdates
+@@ -12806,11 +13135,64 @@ - (void)postAccessibilityUpdates
  
    /* Re-entrance guard: VoiceOver callbacks during notification posting
       can trigger redisplay, which calls ns_update_end, which calls us