The ebuild for app-editors/gedit-0.9.6-r1 contains SLOT="O" (The letter 'O' as in 'Oh my god!' instead of zero). Severity: Embarrassing ;-)
slightly, not that it matters much. Anyway, gedit-0.* will eventually be removed and I don't think changing the slot now is useful. Thnx for the report.
*** Bug 146937 has been marked as a duplicate of this bug. ***