From 3cdb039a29ee7b08d7a562bd3d31ea76d3be45cc Mon Sep 17 00:00:00 2001
From: Mike Hearn <mike@plan99.net>
Date: Tue, 4 Nov 2014 15:10:42 +0100
Subject: [PATCH] Wallet: don't save wallet and invoke event listeners when
 adding watched scripts if the call was a no-op.

---
 core/src/main/java/org/bitcoinj/core/Wallet.java | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/core/src/main/java/org/bitcoinj/core/Wallet.java b/core/src/main/java/org/bitcoinj/core/Wallet.java
index 5b15e184..a7560786 100644
--- a/core/src/main/java/org/bitcoinj/core/Wallet.java
+++ b/core/src/main/java/org/bitcoinj/core/Wallet.java
@@ -766,8 +766,10 @@ public class Wallet extends BaseTaggableObject implements Serializable, BlockCha
         } finally {
             keychainLock.writeLock().unlock();
         }
-        queueOnScriptsChanged(scripts, true);
-        saveNow();
+        if (added > 0) {
+            queueOnScriptsChanged(scripts, true);
+            saveNow();
+        }
         return added;
     }