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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: A solution to display completion candidates after point in a
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Date: Sun, 04 Oct 2020 20:00:04 +0300
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Cc: monnier@iro.umontreal.ca, emacs-devel@gnu.org
To: Gregory Heytings <ghe@sdf.org>
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 (message from Gregory Heytings on Sun, 04 Oct 2020 16:52:10 +0000)
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> Date: Sun, 04 Oct 2020 16:52:10 +0000
> From: Gregory Heytings <ghe@sdf.org>
> cc: monnier@iro.umontreal.ca, emacs-devel@gnu.org
> 
> > AFAIU, this is exactly why we say not to use window-scroll-functions for 
> > this purpose.  IOW, there is indeed a bug here, and the bug is in the 
> > Lisp code you presented: window-scroll-functions are not meant to be 
> > used to affect redisplay, they are meant to inform Lisp programs about 
> > what redisplay is about to do with a window.
> 
> I did not say that there was a bug in redisplay here, I explained what 
> happens, and you said there was a bug, that redisplay should never do 
> this, and asked me to write a recipe, which I did.

Thank you, I was under the impression that redisplay did something like
that by itself, or when the various hooks are used as intended.  I'm
relieved to learn that is not so.