Merge from origin/emacs-27

6de20c7eab (origin/emacs-27) Fix syntax error in man page.
f8607d3c03 Handle filling of indented ChangeLog function entries
7e78f0d1b2 Fix void-variable n-reb in re-builder (Bug#40409)
452d776a5d Fix small bug in copy_string_contents.
fa823653ff Fix invocations of gpg from Gnus
d4f51d0a2e Don't draw GTK's internal border and tab bar on top of eac...
38731d504e ; * src/buffer.c (syms_of_buffer) <inhibit-read-only>: Doc...
44ac9e48bb Tweak htmlfontify's generated output

lisp/emacs-lisp/re-builder.el

@@ -767,22 +767,21 @@ If SUBEXP is non-nil mark only the corresponding sub-expressions."
      (reb-mark-non-matching-parenthesis))
     nil)))
 
-(defsubst reb-while (limit counter where)
-  (let ((count (symbol-value counter)))
-    (if (= count limit)
-        (progn
-          (message "Reached (while limit=%s, where=%s)" limit where)
-          nil)
-      (set counter (1+ count)))))
+(defsubst reb-while (limit current where)
+  (if (< current limit)
+      (1+ current)
+    (message "Reached (while limit=%s, where=%s)" limit where)
+    nil))
 
 (defun reb-mark-non-matching-parenthesis (bound)
   ;; We have a small string, check the whole of it, but wait until
   ;; everything else is fontified.
   (when (>= bound (point-max))
-    (let (left-pars
+    (let ((n-reb 0)
+          left-pars
           faces-here)
       (goto-char (point-min))
-      (while (and (reb-while 100 'n-reb "mark-par")
+      (while (and (setq n-reb (reb-while 100 n-reb "mark-par"))
                   (not (eobp)))
         (skip-chars-forward "^()")
         (unless (eobp)