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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: A solution to display completion candidates after point in a
 minibuffer
Date: Sat, 03 Oct 2020 11:25:48 +0300
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To: Stefan Monnier <monnier@iro.umontreal.ca>
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In-Reply-To: <jwveemggoov.fsf-monnier+emacs@gnu.org> (message from Stefan
 Monnier on Fri, 02 Oct 2020 20:10:46 -0400)
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Fri, 02 Oct 2020 20:10:46 -0400
> Cc: emacs-devel@gnu.org
> 
> >> IIRC the reason it won't scroll the second time around is because point
> >> should be visible (and redisplay would only scroll in order to move point
> >> within view).
> > I don't know, but I'm not sure about that.  If you (set-window-start nil 1)
> > unconditionally in window-scroll-functions, this setting will be obeyed by
> > redisplay, even if point is not visible anymore.
> 
> Oh, indeed, in that case it would move point instead.

No, it could also reject the start-point and try anew, see try_window.