I found the problem. Apparently GtkApplication isn't used properly (see patch). I've almost no experience with Vala or GTK so I can't really say why the old code was crashing, but my patch apparently fixes it.
I found the problem. Apparently GtkApplication isn't used properly (see patch). I've almost no experience with Vala or GTK so I can't really say why the old code was crashing, but my patch apparently fixes it.