From 7f352f861c78a5574bc0975fea71dd6bc744a994 Mon Sep 17 00:00:00 2001
From: Dave Love <fx@gnu.org>
Date: Thu, 26 Oct 2000 09:32:19 +0000
Subject: [PATCH] (custom-mode): Add `special' mode-class property.

---
 lisp/cus-edit.el | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lisp/cus-edit.el b/lisp/cus-edit.el
index 0f697e10502..da0ee18b2d7 100644
--- a/lisp/cus-edit.el
+++ b/lisp/cus-edit.el
@@ -3757,6 +3757,8 @@ if that value is non-nil."
   (add-hook 'widget-edit-functions 'custom-state-buffer-message nil t)
   (run-hooks 'custom-mode-hook))
 
+(put 'custom-mode 'mode-class 'special)
+
 (add-to-list
  'debug-ignored-errors
  "^No user options have changed defaults in recent Emacs versions$")
-- 
2.39.2