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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: New multi-command facility displays in the wrong echo area.
Date: Tue, 13 Oct 2020 05:25:57 +0300
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Cc: ghe@sdf.org, acm@muc.de, monnier@iro.umontreal.ca, emacs-devel@gnu.org
To: Juri Linkov <juri@linkov.net>
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In-Reply-To: <87k0vvz0q2.fsf@mail.linkov.net> (message from Juri Linkov on
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> From: Juri Linkov <juri@linkov.net>
> Cc: Gregory Heytings <ghe@sdf.org>,  acm@muc.de,  monnier@iro.umontreal.ca,
>   emacs-devel@gnu.org
> Date: Mon, 12 Oct 2020 22:46:29 +0300
> 
> AFAIU, the problem is following: typing more characters at the end of
> the minibuffer enlarges the minibuffer window when the minibuffer grows
> longer than the frame's width.  The question is why the minibuffer window
> is not enlarged when an overlay is added at the end of the minibuffer?

It isn't related to the overlay, it is related to the fact that
max-mini-window-height is set to 1.