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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Understanding atomic window groups
Date: Fri, 24 May 2019 11:24:11 +0300
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> From: martin rudalics <rudalics@gmx.at>
> Date: Fri, 24 May 2019 10:01:08 +0200
> Cc: emacs-devel@gnu.org
> 
> 'quit-window' calls 'window-deletable-p' before it tries to delete a
> window so it should never cause a "Root of atomic window is root
> window of its frame" error.  If it does cause an error we have a bug
> so maybe check again.
> 
> 'delete-window' OTOH will raise an error when the root of the atomic
> window is the root of the frame.

I think these factoids should be spelled out in the ELisp manual, and
perhaps also in the doc strings.