// is received. holding_cell_update_fee is updated when there are additional
// update_fee() during ChannelState::AwaitingRemoteRevoke.
holding_cell_update_fee: Option<u64>,
// is received. holding_cell_update_fee is updated when there are additional
// update_fee() during ChannelState::AwaitingRemoteRevoke.
holding_cell_update_fee: Option<u64>,