A window manager that is compliant with these specifications must set this property, so on desktop environments like XFCE, Budgie, Unity, GNOME, KDE - that is in any official Ubuntu flavor that doesn't use any experimental window manager will have this property set in other words, this will work on supported desktops,I would like to support as many desktop environments as possible, but I realize how difficult it would be to do so, since each one may have their own solution.
