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-rw-r--r--lisp/cus-edit.el2
1 files changed, 2 insertions, 0 deletions
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$")