That's not a gnome-desktop bug. Are you using desktop effects or not?
(I've assumed you are for now, so I've reassigned it to Compiz)
** Package changed: gnome-desktop (Ubuntu) => compiz (Ubuntu)
** Changed in: compiz (Ubuntu)
Status: New => Incomplete
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Double clicking a maximized window frame does not restore window
https://bugs.launchpad.net/bugs/374078
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