patches: address review B1-B4 and N1,N3

B4: Shorten all subject lines to <=50 chars (preference from CONTRIBUTE).
B3: Fix intermediate BUF_CHARS_MODIFF state in 0002: use BUF_MODIFF
    from the start, eliminating the wrong-then-corrected pattern across
    patches 0002+0007.
B2: Wrap long NEWS line in Zoom entry (was 80 chars, now <=79).
B1: Long block_input comment already fixed by 0004 in both branches;
    confirmed no change needed in final state.
N1: Fix DEFVAR doc in 0001 to reflect auto-detection at startup.
N3: Convert VoiceOver NEWS bullet list to prose paragraphs.
N2: Skip (existing file uses 80-char separators throughout; changing
    only new ones would be inconsistent).

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

@@ -0,0 +1,135 @@
+From 0359a6e2151454dca5225f9f9df5084c8721ef62 Mon Sep 17 00:00:00 2001
+From: Martin Sukany <martin@sukany.cz>
+Date: Wed, 4 Mar 2026 15:23:55 +0100
+Subject: [PATCH 7/9] doc: add VoiceOver section to macOS appendix
+
+* doc/emacs/macos.texi (VoiceOver Accessibility): New node between
+'Mac / GNUstep Events' and 'GNUstep Support'.  Document screen reader
+usage, keyboard navigation, completion announcements, ns-accessibility-
+enabled, and known limitations.  Use @xref for cross-reference at
+sentence start.  Correct description of ns-accessibility-enabled
+default: initial value is nil, set automatically at startup.
+---
+ doc/emacs/macos.texi | 77 ++++++++++++++++++++++++++++++++++++++++++++
+ src/nsterm.m         | 10 ++++--
+ 2 files changed, 84 insertions(+), 3 deletions(-)
+
+diff --git a/doc/emacs/macos.texi b/doc/emacs/macos.texi
+index 6bd334f48e..72ac3a9aa9 100644
+--- a/doc/emacs/macos.texi
++++ b/doc/emacs/macos.texi
+@@ -36,6 +36,7 @@ Support}), but we hope to improve it in the future.
+ * Mac / GNUstep Basics::        Basic Emacs usage under GNUstep or macOS.
+ * Mac / GNUstep Customization:: Customizations under GNUstep or macOS.
+ * Mac / GNUstep Events::        How window system events are handled.
++* VoiceOver Accessibility::     Screen reader support on macOS.
+ * GNUstep Support::             Details on status of GNUstep support.
+ @end menu
+ 
+@@ -272,6 +273,82 @@ and return the result as a string.  You can also use the Lisp function
+ services and receive the results back.  Note that you may need to
+ restart Emacs to access newly-available services.
+ 
++@node VoiceOver Accessibility
++@section VoiceOver Accessibility (macOS)
++@cindex VoiceOver
++@cindex accessibility (macOS)
++@cindex screen reader (macOS)
++@cindex Zoom, cursor tracking (macOS)
++
++  When built with the Cocoa interface on macOS, Emacs exposes buffer
++content, cursor position, mode lines, and interactive elements to the
++macOS accessibility subsystem.  This enables use with VoiceOver,
++Apple's built-in screen reader, and with other assistive technology
++such as macOS Zoom.
++
++  Toggle VoiceOver with @kbd{Cmd-F5} (or via System Settings,
++Accessibility, VoiceOver).  When Emacs is focused, VoiceOver announces
++the buffer name and current line.  Standard Emacs navigation produces
++speech feedback:
++
++@itemize @bullet
++@item
++Arrow keys read individual characters (left/right) or full lines
++(up/down).
++@item
++@kbd{M-f} and @kbd{M-b} announce words.
++@item
++@kbd{C-n} and @kbd{C-p} read the destination line.
++@item
++Shift-modified movement announces selected or deselected text.
++@item
++@key{TAB} and @kbd{S-@key{TAB}} navigate interactive elements
++(buttons, links, completion candidates) within a buffer.
++@end itemize
++
++  The @file{*Completions*} buffer announces each completion candidate
++as you navigate, even while keyboard focus remains in the minibuffer.
++
++  macOS Zoom (System Settings, Accessibility, Zoom) tracks the Emacs
++cursor automatically when set to follow keyboard focus.  The cursor
++position is communicated via @code{UAZoomChangeFocus} and the
++@code{AXBoundsForRange} accessibility attribute.
++
++@vindex ns-accessibility-enabled
++  To disable the accessibility interface entirely (for instance, to
++eliminate overhead on systems where assistive technology is not in
++use), set @code{ns-accessibility-enabled} to @code{nil}.  Emacs
++detects the presence of assistive technology at startup and sets this
++variable automatically; the initial value is @code{nil}.
++
++@subheading Known Limitations
++
++@itemize @bullet
++@item
++Very large buffers (tens of megabytes) may cause slow initial
++accessibility text extraction.  Once cached, subsequent queries
++are fast.
++@item
++Mode-line text extraction handles only character glyphs.  Mode lines
++using icon fonts (e.g., icon-based mode-lines)
++produce incomplete accessibility text.
++@item
++The accessibility virtual element tree is rebuilt automatically on
++window configuration changes (splits, deletions, new buffers).
++@item
++Right-to-left (bidi) text is exposed correctly as buffer content,
++but @code{accessibilityRangeForPosition} hit-testing assumes
++left-to-right glyph layout.
++@item
++Block-style cursors are handled correctly: character navigation
++announces the character at the cursor position, not the character
++before it.
++@end itemize
++
++  This support is available only on the Cocoa build.  GNUstep has a
++different accessibility model and is not yet supported.
++
++
+ @node GNUstep Support
+ @section GNUstep Support
+ 
+diff --git a/src/nsterm.m b/src/nsterm.m
+index b66f350486..4261886974 100644
+--- a/src/nsterm.m
++++ b/src/nsterm.m
+@@ -14756,9 +14756,13 @@ Nil means use fullscreen the old (< 10.7) way.  The old way works better with
+ 
+   DEFVAR_BOOL ("ns-accessibility-enabled", ns_accessibility_enabled,
+      doc: /* Non-nil enables Zoom cursor tracking and VoiceOver support.
+-Emacs sets this automatically at startup when macOS Zoom is active or
+-any assistive technology (VoiceOver, Switch Control, etc.) is connected,
+-and updates it whenever that state changes.  You can override manually:
++Emacs detects at startup whether macOS Zoom is active or an assistive
++technology (VoiceOver, Switch Control, etc.) is connected, and sets
++this variable accordingly.  It updates automatically when accessibility
++state changes.  The initial value is nil; it becomes non-nil only when
++an AT is detected.
++
++You can override the auto-detection:
+ 
+   (setq ns-accessibility-enabled t)   ; always on
+   (setq ns-accessibility-enabled nil) ; always off
+-- 
+2.43.0
+