Set holder_tx_signed=true in block_confirmed so new channel updates are rejected.

Author: rmalonson

lightning/src/chain/channelmonitor.rs

@@ -3491,6 +3491,10 @@ impl<Signer: WriteableEcdsaChannelSigner> ChannelMonitorImpl<Signer> {
 			let commitment_package = PackageTemplate::build_package(self.funding_info.0.txid.clone(), self.funding_info.0.index as u32, PackageSolvingData::HolderFundingOutput(funding_outp), self.best_block.height(), self.best_block.height());
 			claimable_outpoints.push(commitment_package);
 			self.pending_monitor_events.push(MonitorEvent::CommitmentTxConfirmed(self.funding_info.0));
+			// Although we aren't signing the transaction directly here, the transaction will be signed
+			// in the claim that is queued to OnchainTxHandler. We set holder_tx_signed here to reject
+			// new channel updates.
+			self.holder_tx_signed = true;
 			// We can't broadcast our HTLC transactions while the commitment transaction is
 			// unconfirmed. We'll delay doing so until we detect the confirmed commitment in
 			// `transactions_confirmed`.