Commit 76538660fb ("Port xconfig to Qt5 - Remove custom
ListView classes.") removed the original implementation, where
ConfigItem::okRename() overrode Q3ListViewItem::okRename().
Commit 59e564408f ("Port xconfig to Qt5 - Put back some of the
old implementation.") restored the empty stub, but it seems
useless.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>