Comment 303 for bug 11334

Specifications are one thing, but there needs to be also something providing the functionality. While KDE's Klipper is run by default, I'm rather sure it doesn't implement this, I have no idea about other desktops, but IIRC GNOME has never really officially included a clipboard manager, so it's a question of how many users would have it there.

But fair enough, I guess this can be kept open for when somebody will feel like implementing this.