Commits on Apr 13, 2023

1. Store state when sending commitment_signed …

   If we only store state when sending `tx_signatures`, there are cases where
   we cannot reconcile states if a disconnection occurs during the signing
   steps: one side will have sent `tx_signatures` and thus must wait for the
   transaction to be spent or double-spent, while the other side has already
   forgotten that channel because they haven't sent `tx_signatures`.
   
   This is fixed by storing state when sending `commitment_signed`, and
   adding a `next_funding_txid` field to `channel_reestablish` to ask our
   peer to retransmit signatures that we haven't received.

   

   t-bast committed Apr 13, 2023
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