Comment 21 for bug 1294600

I talked about this fix that fix the tearing with the Nvidia proprietary (http://git.xfce.org/xfce/xfwm4/commit/?id=8a67212860898ef02fee79f64fc774bc14ed769c) but, more important, there is also this fix that fix the tearing for everybody :

http://git.xfce.org/xfce/xfwm4/commit/?id=fee08eafa751a153ff93b04152ea66334141cac5

I really think that must be added to Xubuntu 16.04