inputMethod: Do not change IBus.Capabilite by focus events
gnome-shell calls ibus_input_context_focus_in() in InputMethod.focus_in() but the event is not actually forwarded to panels and engines in GNOME Wayland because gnome-shell changes IBus.Capabilite by focus events and disables IBus.Capabilite.FOCUS when ibus_input_context_focus_in() is called.
IBus.Capabilite is assumed a fixed value per input context in the first place and it should not be changed by focus events.
Edited by Takao Fujiwara