Include narrowing indication in describe-mode

* lisp/help.el (describe-mode): Include "Narrow", if narrowing is
active.  (Bug#31139)

Copyright-paperwork-exempt: yes

1 files changed, 4 insertions, 0 deletions

diff --git a/lisp/help.el b/lisp/help.el
index 8e6604d2dba..844087a72f3 100644
--- a/lisp/help.el
+++ b/lisp/help.el
@@ -908,6 +908,10 @@ documentation for the major and minor modes of that buffer."
                    (push (list fmode pretty-minor-mode
                                (format-mode-line (assq mode minor-mode-alist)))
                          minor-modes)))))
+        ;; Narrowing is not a minor mode, but its indicator is part of
+        ;; mode-line-modes.
+        (when (buffer-narrowed-p)
+          (push '(narrow-to-region "Narrow" " Narrow") minor-modes))
         (setq minor-modes
               (sort minor-modes
                     (lambda (a b) (string-lessp (cadr a) (cadr b)))))