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That's one of those KDE features. Probably not popular enough for GNOME or somethin.
Yeah, and I bet the day GNOME puts the feature in, it will be like -- Oooh look at this cool feature! Now GNOME is the BEST KDe out there.
Seriously, its a case of obfuscating the past -- George Orwell style, IMO. KDE has implemented each and every feature that GNOME has first but somehow it always gets more "media attention" once GNOME implements it, partial or otherwise.