Fixed upstream with <http://git.xfce.org/xfce/xfwm4/commit/?id=7eff3d69403059aa184310a0f231920b67c3b8e6> (not sure it'll be backported on 4.8, but it'll be in 4.10 anyway).
Fixed upstream with <http:// git.xfce. org/xfce/ xfwm4/commit/ ?id=7eff3d69403 059aa184310a0f2 31920b67c3b8e6> (not sure it'll be backported on 4.8, but it'll be in 4.10 anyway).