Subject: Re: bug#57080: 28.1; The %m modeline construct does not work for emacs-lisp-mode

From: Eli Zaretskii <[email-masked]>
Date: Tue, 09 Aug 2022 19:45:01 +0300

> From: diredwolf <[email-masked]>
> Date: Tue, 9 Aug 2022 18:06:16 +0200
> 
> - Launch emacs -q
> - Evaluate this :: (setq-default mode-line-format "[%m]")
> 
> For every major mode you should see for example [Message] or [Dired by
> name] or [Help] but for elisp-mode you get [].

%m in mode-line-format is obsolete; use the variable mode-name
instead.

(The technical reason behind what you see is that %m displays the mode
name only if the value of mode-name is a string, which in this case it
isn't.)