This problem is fixed but it have to be included in Xubuntu
https://bugs.launchpad.net/ubuntu/+source/xfwm4/+bug/1486970
http://git.xfce.org/xfce/xfwm4/commit/?id=8a67212860898ef02fee79f64fc774bc14ed769c
This problem is fixed but it have to be included in Xubuntu
https:/ /bugs.launchpad .net/ubuntu/ +source/ xfwm4/+ bug/1486970
http:// git.xfce. org/xfce/ xfwm4/commit/ ?id=8a672128608 98ef02fee79f64f c774bc14ed769c