https://bugzilla.redhat.com/show_bug.cgi?id=1520396
--- Comment #6 from Akira TAGOH tagoh@redhat.com --- because gnome-settings-daemon doesn't have org.gnome.settings-daemon.plugins.keyboard schema anymore (ref: https://bugzilla.gnome.org/show_bug.cgi?id=772370). thus imsettings can't detect if GNOME is responsible to manage IM or not.
dunno if it is still possible or simply give up to do that and disable it completely on GNOME at all.