Re: improper behavior of (scroll-down 0)

[Eli Zaretskii]

> Date: Fri, 12 Feb 2016 17:41:11 +0800
> From: Shiyao Ma <i@introo.me>
> Cc: help-gnu-emacs@gnu.org
> 
> yup, I'd admit the plain (scroll-down 0) is meaningless.
> 
> Actually the scrolling down part is of the form (scroll-down scrollable), the 
> origin is here: 
> https://github.com/emacsmirror/evil/blob/master/evil-commands.el#L870
> 
> When `scrollable' becomes 0, the undesired behavior happens.
> 
> Another observation is, the undesired behavior doesn't happen under *scratch* 
> buffer or others alike.
> 
> The info mode has sort of a navigation bar, "(elisp)Top > Positions > 
> Excursions", maybe (scroll-down)
> doesn't handle that well.

The first line you see in an Info buffer is not normal text, it is a
specially displayed string.  That is the reason for the somewhat
strange behavior.