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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: improper behavior of (scroll-down 0)
Date: Thu, 11 Feb 2016 23:01:06 +0200
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	(message from Shiyao Ma on Thu, 11 Feb 2016 19:08:27 +0800)
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> Date: Thu, 11 Feb 2016 19:08:27 +0800
> From: Shiyao Ma <i@introo.me>
> 
> 1. go to the info node (elisp)Top > Positions > Excursions
> 2. go to the beginning of the window: (goto-char (point-min))
> 3. scroll the window, (scroll-down 0)
> 
> Oops, the window scrolls down by 1.
> 
> What's happening here and how to rectify this ?

What is the problem, exactly?  What do you want (scroll-down 0) to do,
and why?