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bug#32002: 24.4; Scroll bar start, end not correct

From: martin rudalics
Subject: bug#32002: 24.4; Scroll bar start, end not correct
Date: Mon, 23 Jul 2018 08:51:11 +0200

>> My knowledge of what scrolling should do is too limited.
> (It seems like I need to put my instructor hat on today ;-)
> Let me fill you in: scrolling just needs to set the window's start
> point to the desired value, all the rest is done by redisplay.  As
> simple as that.

Apparently we want scrolling also to second-guess the desired value.
So things seem more complicated than that.

> (Well, if you need to scroll more than one screenful, then you need to
> worry about a few other things, like setting point such that Emacs
> won't scroll back to where point is.  But this is not one of those
> cases, we just scroll by one line here.)

Emacs scrolls by more than one line in the case at hand.


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