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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Scrolling commands and skipping redisplay, was: Re: emacs
 rendering comparisson between emacs23 and emacs26.3
Date: Tue, 21 Apr 2020 16:27:48 +0300
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Cc: rms@gnu.org, emacs-devel@gnu.org, rudalics@gmx.at, rrandresf@gmail.com,
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To: Stefan Monnier <monnier@iro.umontreal.ca>
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In-Reply-To: <jwvtv1dygjx.fsf-monnier+emacs@gnu.org> (message from Stefan
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: dgutov@yandex.ru,  acm@muc.de,  rrandresf@gmail.com,
>   emacs-devel@gnu.org,  rms@gnu.org,  rudalics@gmx.at
> Date: Mon, 20 Apr 2020 17:50:20 -0400
> 
> What I meant is that if the setting is 1 and the line height is, say, 13
> pixels, we could consider any displacement of strictly less than 26
> pixels to be "within the limits".

That would mean the last line we scroll into the window will be only
partially visible, and that is a no-no in scrolling.