patches: fix all round-1 blockers (B1 B3 B5 B6)

B1 (0007): Fix dangling comment - change context line to deletion so
the opening comment of the removed ns_ax_face_is_selected function
is properly deleted, not left as an unclosed comment fragment that
would cause a compilation failure.

B3 (0002): Fix block_input/record_unwind_protect_void ordering in
two places in accessibilityRangeForPosition: and related method.
Correct order: block_input() BEFORE record_unwind_protect_void(),
so the unwind handler cannot call unblock_input without a matching
block_input even if specpdl_push fails.

B5 (0008): Replace goto skip_overlay_scan with proper if-block.
The goto skipped over ObjC variable declarations which is poor style
and would be flagged by Emacs maintainers.  Restructure as
if (MINI_WINDOW_P (w) && !didTextChange) { ... }.

B6 (0008): Fix nlines < 128 to nlines < 512 in ns_ax_selected_child_
frame_text.  Arrays line_starts[] and line_ends[] are declared with
size 512; the trailing-line guard used 128, silently dropping the
last line for buffers with 128-511 lines.

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

@@ -477,8 +477,8 @@ index c9fe93a57b..f7574efb39 100644
 +	 echo produced by postTextChangedNotification, making typed
 +	 characters inaudible.  VoiceOver should read the overlay
 +	 candidate only when the user navigates (C-n/C-p), not types.  */
-+      if (!MINI_WINDOW_P (w) || didTextChange)
-+	goto skip_overlay_scan;
++      if (MINI_WINDOW_P (w) && !didTextChange)
++	  {
 +
 +      int selected_line = -1;
 +      NSString *candidate
@@ -536,9 +536,9 @@ index c9fe93a57b..f7574efb39 100644
 +		annInfo);
  	    }
  	}
++	  }
      }
  
-+ skip_overlay_scan:
    /* --- Cursor moved or selection changed ---
       Independent check from the overlay branch above.  */
    if (point != self.cachedPoint || markActive != self.cachedMarkActive)