fn decide_events_from_chain(
chain: Vec<DecidedLeaf>,
cert2: Option<Certificate2<SeqTypes>>,
deciding_qc: Option<Arc<CertificatePair<SeqTypes>>>,
) -> Vec<CoordinatorEvent<SeqTypes>>fn decide_events_from_chain(
chain: Vec<DecidedLeaf>,
cert2: Option<Certificate2<SeqTypes>>,
deciding_qc: Option<Arc<CertificatePair<SeqTypes>>>,
) -> Vec<CoordinatorEvent<SeqTypes>>