ibus-hangul should default to vertical candidate selection.
ibus will use vertival loppkup table in ko locale. Fixed in ibus-1_1_0_20090407-1_fc11
There was a misunderstanding. We want it to be vertical for both Japanese and Korean candidate selection so this language input interface behaves identically no matter what your desktop locale is.
ibus now default to vertical for all locale for f11.
*** Bug 488666 has been marked as a duplicate of this bug. ***