Add an invisible <i></i> tag to the first line to cheat on Qt's rich text heuristic.
(I do not like doing this commit, but at the moment this seems the only solution to get a broad support for styled notification (should now work at least with Gnome 3, XFCE, awesome and KDE 4))
Add markup to the first notification line to overcome problems with K…
Reported KDE bug: https://bugs.kde.org/show_bug.cgi?id=317572
(so that hopefully this quickfix is not needed anymore)