f - prefer scid with smallest block height

Author: jkczyz

lightning/src/blinded_path/mod.rs

@@ -21,6 +21,7 @@ use crate::offers::invoice::BlindedPayInfo;
 use crate::routing::gossip::{NodeId, ReadOnlyNetworkGraph};
 use crate::sign::EntropySource;
 use crate::util::ser::{Readable, Writeable, Writer};
+use crate::util::scid_utils;
 
 use crate::io;
 use crate::prelude::*;
@@ -231,7 +232,8 @@ impl BlindedPath {
 				if let Some((scid, channel_info)) = node_info
 					.channels
 					.iter()
-					.find_map(|scid| network_graph.channel(*scid).map(|info| (*scid, info)))
+					.filter_map(|scid| network_graph.channel(*scid).map(|info| (*scid, info)))
+					.min_by_key(|(scid, _)| scid_utils::block_from_scid(*scid))
 				{
 					let direction = if node_id == channel_info.node_one {
 						Direction::NodeOne