A context that had not sent FocusIn had every key rejected outright, so
the input method was silently dead in a client that omits or delays it,
and in the documented case of two applications whose focus events cross.
ibus-daemon and fcitx5 both treat a key as focus; strans, which plays the
daemon here, now does too. A release still does not focus, and the
engine's own owner rule is unchanged.