Code review comment for lp:~nick-dedekind/mir/trusted_sessions

> In TrustSession::add_trusted_child() there's a call
> "session->begin_trust_session();" which will send a
> mir_event_type_trust_session_state_change to the "child" process.
>
> But AIUI the child isn't the "helper" process that created the trust session
> and can't have registered a mir_trust_session_event_callback (which needs a
> trust session).

Right. this was so that the participants could be informed that a trust session has been started with them; if they need to do anything fancy. But at the moment, I don't think there's a client API for applying for general distributor events (only trust session & surface events I think), so I've removed the event send from the participants, but left it on the helper.