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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: 27.0.50: How can I test a buffer-local
 window-configuration-change-hook in batch mode?
Date: Fri, 25 Oct 2019 12:34:21 +0300
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To: martin rudalics <rudalics@gmx.at>
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> From: martin rudalics <rudalics@gmx.at>
> Date: Fri, 25 Oct 2019 11:20:06 +0200
> Cc: emacs-devel@gnu.org
> 
>  > I don't know why Martin needed run-window-configuration-change-hook,
>  > it doesn't seem to be called anywhere in Emacs.
> 
> It was previously used for running the buffer-local functions on that
> hook from Elisp with the respective buffer current and its windows
> selected.  It's no more called now.

So, a historic accident.  Maybe we should deprecate it.