Bisect revealed the regression is caused by http://git.xfce.org/xfce/xfwm4/commit/?id=7c87af29befcc91ba2e890dd822a4a69cb3263d9
Bisect revealed the regression is caused by http:// git.xfce. org/xfce/ xfwm4/commit/ ?id=7c87af29bef cc91ba2e890dd82 2a4a69cb3263d9