https://bugzilla.redhat.com/show_bug.cgi?id=1520396
--- Comment #1 from fujiwara tfujiwar@redhat.com --- ibus-ui-gtk3 is no longer launched in GNOME desktop so it should not happen. I don't know which part is the handler GUI but it might be Property Panel. You can hide the GUI with ibus-setup -> "Do not show" in Show property panel if the GUI is the part of Property Panel.