GNU bug report logs - #36421
Having some text with face height > 1.0 causes scroll-step to be ignored

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Stefan Kangas <stefan <at> marxist.se>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#36421: closed (Having some text with face height > 1.0 causes
 scroll-step to be ignored)
Date: Mon, 16 Sep 2019 03:09:01 +0000

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Your message dated Mon, 16 Sep 2019 05:08:30 +0200
with message-id <CADwFkmmNtySrgsnsJoLzwF1SDnVYLhBO-6PFdi3dwQ9O2vhUFg <at> mail.gmail.com>
and subject line Re: bug#36421: Having some text with face height > 1.0 causes scroll-step to be ignored
has caused the debbugs.gnu.org bug report #36421,
regarding Having some text with face height > 1.0 causes scroll-step to be ignored
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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36421: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=36421
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From: Andrea Cardaci <cyrus.and <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Having some text with face height > 1.0 causes scroll-step to be
 ignored
Date: Fri, 28 Jun 2019 18:19:58 +0200

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Hi,

Basically as the title says, here's how to reproduce this:

1. start Emacs with -Q;

2. evaluate this sexp:

   (progn
     (custom-set-variables
      '(scroll-step 1)
      '(scroll-margin 0))
     (with-current-buffer (switch-to-buffer "test")
       (insert (make-string 100 ?\n)
      (propertize "XXX" 'face '(:height 2.0))
      (make-string 100 ?\n))))

3. in the newly created buffer press and keep pressed <up>.

You'll notice that the point moves to the top of the window and stays
there, but as soon as it *steps* over "XXX", the point is centered.

This is pretty annoying in my case where I use big headings in Markdown
mode.

This happens, at least, in Emacs 25.1.1, 24.5.1 and 26.2 on Linux. Please
let me know if you need additional details.


Best,

Andrea

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From: Stefan Kangas <stefan <at> marxist.se>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 36421-done <at> debbugs.gnu.org, pipcet <at> gmail.com,
 Andrea Cardaci <cyrus.and <at> gmail.com>
Subject: Re: bug#36421: Having some text with face height > 1.0 causes
 scroll-step to be ignored
Date: Mon, 16 Sep 2019 05:08:30 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

> tags 36421 notabug
> thanks
>
> > From: Andrea Cardaci <cyrus.and <at> gmail.com>
> > Date: Sat, 29 Jun 2019 01:29:54 +0200
> > Cc: 36421 <at> debbugs.gnu.org
> >
> > Yes, thanks, I'm aware of that (and actually the issue doesn't appear if I use a value > 100 for that variable),
> > but it does a different thing, for example it does not center anymore the next word when I use interactive
> > search and that's something nice to have.
> >
> > Moreover, it looks like a bug nevertheless...
>
> It is not a bug.  scroll-step works in units of the canonical line
> height, not of the actual height of the line that needs to be scrolled
> into the view.

Since this is notabug, I'm also closing it now.

Best regards,
Stefan Kangas

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