bug#18912: 24.4; mode-line corruption on graphical frames in dual-headed display

[Eli Zaretskii]

> Date: Mon, 03 Nov 2014 22:24:57 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 18912@debbugs.gnu.org
> 
> > Date: Mon, 03 Nov 2014 18:06:28 -0200
> > From: Bruno Félix Rezende Ribeiro <oitofelix@gnu.org>
> > CC: rudalics@gmx.at, 18912@debbugs.gnu.org
> > 
> > For the sake of precision I used the method suggested by Martin:
> > evaluating the expression
> > 
> > (while (y-or-n-p "decrease?")
> >   (set-frame-height nil (1- (frame-text-height)) nil t))
> > 
> > in the requested condition.  In order to not be fooled by a spurious
> > mode-line redrawing, I killed the buffer and invoked 'C-x d /dev RET'
> > again and the glitch was gone, after one iteration (minus 1 pixel).

What happens in the "good" configuration if you decrease or increase
the frame height there by 1 pixel?