Bug#836426: Caused by libgtk-3-0 3.21

[Josh Triplett]

On Thu, Sep 08, 2016 at 01:48:01PM +0200, Michael Biebl wrote:
> Am 08.09.2016 um 03:23 schrieb Josh Triplett:
> > It seems appropriate for an issue that causes window contents to fail to
> > render, making gnome-boxes unusable with that version of GTK+.  
> 
> The emacs warnings don't look critical and are most likely something
> which needs to be addressed in emacs.

I don't know the associated impact of those; if they're *just* a warning
with no other impact, then perhaps.

> As for gnome-boxes, can you reproduce the problem with 3.21.3 from
> unstable? I just tested a local installation of debian 8.5 and that
> worked fine. I don't have  windows ISO to test whether that is
> reproducible with that setup.

I'll test gnome-boxes 3.21.3 next week.

However, it seems like a compatibility issue if upgrading to a new
libgtk-3-0 with the same SONAME breaks applications that worked with a
previous version.  Other than rare circumstances like "application doing
something always clearly documented as broken and old versions let them
get away with it", which might *occasionally* be justifiable if it
doesn't cause significant breakage in practice, generally that kind of
compatibility issue seems like a bug in the library, not the
application.

> I think it would be best if you file this issue upstream at the
> gnome-boxes bug tracker
> https://bugzilla.gnome.org/enter_bug.cgi?product=gnome-boxes

Before reporting it there, I'd need to confirm that 1) the bug still
appears with gnome-boxes 3.21.3 and 2) the bug actually lies in
gnome-boxes rather than in libgtk-3-0.