From fb75aa94a9f47d53ce7246c14d739fc53dc38197 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=BF=97=E5=AE=87?= <hello@evanlinjin.me>
Date: Thu, 11 May 2023 11:59:57 +0800
Subject: [PATCH] Clarify `TxGraph::try_filter_chain_unspents` logic

---
 crates/chain/src/tx_graph.rs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/crates/chain/src/tx_graph.rs b/crates/chain/src/tx_graph.rs
index f0a095ac..b56fbf62 100644
--- a/crates/chain/src/tx_graph.rs
+++ b/crates/chain/src/tx_graph.rs
@@ -865,7 +865,12 @@ impl<A: Anchor> TxGraph<A> {
         outpoints: impl IntoIterator<Item = (S, OutPoint)> + 'a,
     ) -> impl Iterator<Item = Result<(S, FullTxOut<ObservedAs<A>>), C::Error>> + 'a {
         self.try_filter_chain_txouts(chain, chain_tip, outpoints)
-            .filter(|r| !matches!(r, Ok((_, full_txo)) if full_txo.spent_by.is_some()))
+            .filter(|r| match r {
+                // keep unspents, drop spents
+                Ok((_, full_txo)) => full_txo.spent_by.is_none(),
+                // keep errors
+                Err(_) => true,
+            })
     }
 
     /// Get a filtered list of unspent outputs (UTXOs) from the given `outpoints` that are in