From 3f3055e1d22a5e282a55b2e522c747ba02aee471 Mon Sep 17 00:00:00 2001
From: Zarius <zariust@gmail.com>
Date: Thu, 25 Apr 2013 03:08:24 +1000
Subject: [PATCH] Don't Fire PistonExtendEvent Twice

Set data earlier for BlockPiston when extending. Fixes BUKKIT-3523

diff --git a/src/main/java/net/minecraft/server/BlockPiston.java b/src/main/java/net/minecraft/server/BlockPiston.java
index 2d9e766..b2c8499 100644
--- a/src/main/java/net/minecraft/server/BlockPiston.java
+++ b/src/main/java/net/minecraft/server/BlockPiston.java
@@ -71,6 +71,7 @@ public class BlockPiston extends Block {
                     if (event.isCancelled()) {
                         return;
                     }
+                    world.setData(i, j, k, i1 | 8, 2);
                     // CraftBukkit end
 
                     world.playNote(i, j, k, this.id, 0, i1);
-- 
1.8.1.2