From 1916b522325da7e8f0b8bd7ef187d273dbf3c3fe Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Mon, 2 Jan 2017 02:07:24 -0500
Subject: [PATCH] MC-111699: Ignore Improper Anvil Item Name Packets

The client is improperly sending Item Name Packets to the server BEFORE
the click event. This causes the server to reset before the click event is processed

This breaks the ability to rename more than 1 item at a time.

See: https://bugs.mojang.com/browse/MC-111699

diff --git a/src/main/java/net/minecraft/server/PlayerConnection.java b/src/main/java/net/minecraft/server/PlayerConnection.java
index 964de593b..87683b20b 100644
--- a/src/main/java/net/minecraft/server/PlayerConnection.java
+++ b/src/main/java/net/minecraft/server/PlayerConnection.java
@@ -2434,7 +2434,7 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
                                 String s4 = SharedConstants.a(packetplayincustompayload.b().e(32767));
 
                                 if (s4.length() <= 30) {
-                                    containeranvil.a(s4);
+                                    if (!s4.isEmpty() || containeranvil.getSlot(2).getItem().isEmpty()) containeranvil.a(s4); // Paper - Hack Fix for MC-111699
                                 }
                             } else {
                                 containeranvil.a("");
-- 
2.12.0.windows.1