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From: Michael Heerdegen via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>
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Subject: Re: Operation of format-mode-line
Date: Sat, 27 Jul 2024 14:06:02 +0200
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Heime <heimeborgia@protonmail.com> writes:

> > (buffer-name (window-buffer))
>
> With your replacement, the buffer name is still not getting updated,
> even though the window gets updated with the correct buffer.

I vaguely remember that this won't work.  I suggest you use "%b".


Michael.