Comment 2 for bug 790027

The 'displayed' is simply removing an entry from X-Ayatana-Desktop-Shortcuts= line
I guess not really a terribly useful thing, though here have done from time to time

Ex. - I may have 10 shortcut groups in a ' Utility' .desktop, but decide for the moment i'm only using 7 of them from the quicklist.
Rather than remove the [WhatEver Shortcut Group] entries themselves, just removing WhatEver from X-Ayatana-Desktop-Shortcuts= line removes WhatEver from the icon quicklist
It can be restored by just adding back to X-Ayatana-Desktop-Shortcuts= in the desired position

I'm not aware of any issue from having 'non-displayed' Shortcut Group 's in a .desktop. (though I'm sure there are many things I'm not aware of