A rapid search on X bug tracker lead to https://bugs.freedesktop.org/show_bug.cgi?id=18974 which looks similar to the issue I'm facing.
-- Alexandre Fayolle LOGILAB, Paris (France) Formations Python, Zope, Plone, Debian: http://www.logilab.fr/formations Développement logiciel sur mesure: http://www.logilab.fr/services Informatique scientifique: http://www.logilab.fr/science
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