input-method-relay: Inform the input method that we submitted preedit

Guido Güntherrequested to merge
guidog/phoc:submit-preedit into main

When we submit preedit on focus change we need to let the input method know that this happened, otherwise it may send the same preedit again.

Closes: https://gitlab.com/schmiddi-on-mobile/flare/-/issues/272#note_2900347912 Signed-off-by: Guido Günther agx@sigxcpu.org

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