From 2a334b73ecadf5353127ea699b17f82705b9d589 Mon Sep 17 00:00:00 2001
From: Gregory Sanders <gsanders87@gmail.com>
Date: Tue, 9 Apr 2019 13:06:09 -0400
Subject: [PATCH] Slightly smarter change key vector padding

---
 src/interfaces/wallet.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/interfaces/wallet.cpp b/src/interfaces/wallet.cpp
index 312ca27803..9766fc5f9e 100644
--- a/src/interfaces/wallet.cpp
+++ b/src/interfaces/wallet.cpp
@@ -237,8 +237,11 @@ public:
         auto pending = MakeUnique<PendingWalletTxImpl>(m_wallet);
         // Pad change keys to cover total possible number of assets
         // One already exists(for policyAsset), so one for each destination
-        for (size_t i = 0; i < recipients.size(); ++i) {
-            pending->m_keys.emplace_back(new CReserveKey(&m_wallet));
+        std::set<CAsset> assets_seen;
+        for (const auto& rec : recipients) {
+            if (assets_seen.insert(rec.asset).second) {
+                pending->m_keys.emplace_back(new CReserveKey(&m_wallet));
+            }
         }
         if (!m_wallet.CreateTransaction(recipients, pending->m_tx, pending->m_keys, fee, change_pos,
                 fail_reason, coin_control, sign)) {