GNU bug report logs - #53275
29.0.50; Cursor shows up at the middle of the screen after window start is forced when vscroll is set

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Po Lu <luangruo <at> yahoo.com>
Cc: 53275 <at> debbugs.gnu.org
Subject: bug#53275: 29.0.50; Cursor shows up at the middle of the screen after window start is forced when vscroll is set
Date: Sat, 15 Jan 2022 15:59:54 +0200

> From: Po Lu <luangruo <at> yahoo.com>
> Cc: 53275 <at> debbugs.gnu.org
> Date: Sat, 15 Jan 2022 15:52:50 +0800
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> >>   (progn
> >>     (set-window-vscroll nil 30 t)
> >>     (redisplay)
> >>     (set-window-start nil (point-max)))
> 
> > Sorry, I missed the "M-<" part.  With it, the behavior is
> > reproducible, but I'm not sure I understand what is "the correct
> > position" of the cursor in this case
> 
> It should show up where point is, which in this case is at the window
> start.
> 
> > or why does it matter what Emacs does in that case (except that it
> > should not crash).
> 
> Precision scrolling relies on this: when the buffer cannot be scrolled
> downwards sufficiently, it sets the window start to point-max and
> redisplays, which right now results in the cursor being displayed in the
> middle of the screen until the next redisplay.

Should be fixed now on the master branch.

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