From cf6771596bf5e94691b3692319d1c30816eeef19 Mon Sep 17 00:00:00 2001
From: DanGould <d@ngould.dev>
Date: Tue, 21 May 2024 11:10:45 -0400
Subject: [PATCH] Contribute even when a sender makes no change

A pure consolidation does not suffer from Unnecessary Input Heuristic.
A Payjoin consolidation without sender change still breaks Common Input
Heuristic. Allow it.
---
 payjoin/src/receive/mod.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/payjoin/src/receive/mod.rs b/payjoin/src/receive/mod.rs
index e99c1bdd..c8c83124 100644
--- a/payjoin/src/receive/mod.rs
+++ b/payjoin/src/receive/mod.rs
@@ -361,8 +361,9 @@ impl ProvisionalProposal {
             return Err(SelectionError::from(InternalSelectionError::Empty));
         }
 
-        if self.payjoin_psbt.outputs.len() != 2 {
-            // Current UIH techniques only support many-input, two-output transactions.
+        if self.payjoin_psbt.outputs.len() > 2 {
+            // This UIH avoidance function supports only
+            // many-input, n-output transactions such that n <= 2 for now
             return Err(SelectionError::from(InternalSelectionError::TooManyOutputs));
         }