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

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: Bruno Félix Rezende Ribeiro <oitofelix@gnu.org>,
>   18912@debbugs.gnu.org
> Date: Tue, 04 Nov 2014 15:13:51 -0500
> 
> > Moreover, the fact that running xrefresh, which is not an Emacs
> > command, fixes the display is yet another argument against this
> > hypothesis.  xrefresh doesn't communicate with Emacs, so the only way
> > it could fix the display is if the data supplied by Emacs was correct.
> 
> Actually xrefresh does (indirectly) communicate with Emacs, IIRC, since
> it causes the X server to generate "expose" events to redraw everything.

Then it should have the same effect as redraw-display, but evidently
doesn't.