GNU bug report logs - #32002
24.4; Scroll bar start, end not correct

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From: Mike Kupfer <mkupfer <at> alum.berkeley.edu>
To: martin rudalics <rudalics <at> gmx.at>
Cc: npostavs <at> gmail.com, Eli Zaretskii <eliz <at> gnu.org>, 32002 <at> debbugs.gnu.org, rpluim <at> gmail.com, kurn <at> sfu.ca
Subject: bug#32002: 24.4; Scroll bar start, end not correct
Date: Fri, 20 Jul 2018 17:28:31 -0700

Hi Martin, sorry about the delayed reply.

martin rudalics wrote:

> >> Then it would be interesting to break at the two if tests cited above
> >> to find out why the scroll bar is hidden for (-2 ...) in the 26 case
> >> and not in the 25 one.  Can you post the respective values of 'height'
> >> and 'msl'?
> >
> > Since scale is 1, do you still want this?  (It would take some time to
> > get the results for Emacs 25, since I don't have the source that Debian
> > used immediately available.)  The values for Emacs 26 are
> >
> >    (gdb) print height
> >    $10 = 15
> >    (gdb) print msl
> >    $11 = 21
> 
> and in this case the scroll bar is not displayed as expected.  Since
> your Emacs 25 does display the scroll bar in this case we would have
> to find out why.  So it would be nice if you debugged _any_ version
> that (1) does display a non-fitting scroll bar and (2) does not show
> steppers because we already know that Emacs can't handle steppers.
> Then we could look why in that version the msl < height check fails.

I built Emacs 25.3 from source, and it behaves the same for me as Emacs
26 (no scrollbar appears).  I don't know why the bundled emacs25 behaved
differently.  Maybe different configuration options, or Debian-specific
patches?  But at this point I have enough other things on my to-do list
that I'd rather not spend more time trying to track it down.

best regards,
mike

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