From 049ceb1e1da52d7580d5f05bff70a4d9955f589b Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Fri, 17 Jun 2016 20:50:11 -0400
Subject: [PATCH] Fix Old Sign Conversion

1) Sign loading code was trying to parse the JSON before the check for oldSign.
   That code could then skip the old sign converting code if it triggers a JSON parse exception.
2) New Mojang Schematic system has Tile Entities in the new converted format, but missing the Bukkit.isConverted flag
   This causes Igloos and such to render broken signs. We fix this by ignoring sign conversion for Defined Structures

diff --git a/src/main/java/net/minecraft/server/DefinedStructure.java b/src/main/java/net/minecraft/server/DefinedStructure.java
index 83db94c4ab..dd635292ec 100644
--- a/src/main/java/net/minecraft/server/DefinedStructure.java
+++ b/src/main/java/net/minecraft/server/DefinedStructure.java
@@ -215,9 +215,11 @@ public class DefinedStructure {
                                         definedstructure_blockinfo1.c.setInt("x", blockposition1.getX());
                                         definedstructure_blockinfo1.c.setInt("y", blockposition1.getY());
                                         definedstructure_blockinfo1.c.setInt("z", blockposition1.getZ());
+                                        tileentity.isLoadingStructure = true; // Paper
                                         tileentity.load(definedstructure_blockinfo1.c);
                                         tileentity.a(definedstructureinfo.b());
                                         tileentity.a(definedstructureinfo.c());
+                                        tileentity.isLoadingStructure = false; // Paper
                                     }
                                 }
 
diff --git a/src/main/java/net/minecraft/server/TileEntity.java b/src/main/java/net/minecraft/server/TileEntity.java
index c5212417c6..b3c5766a27 100644
--- a/src/main/java/net/minecraft/server/TileEntity.java
+++ b/src/main/java/net/minecraft/server/TileEntity.java
@@ -11,6 +11,7 @@ import org.bukkit.inventory.InventoryHolder; // CraftBukkit
 public abstract class TileEntity implements KeyedObject { // Paper
 
     public Timing tickTimer = MinecraftTimings.getTileEntityTimings(this); // Paper
+    boolean isLoadingStructure = false; // Paper
     private static final Logger a = LogManager.getLogger();
     private final TileEntityTypes<?> e; public TileEntityTypes getTileEntityType() { return e; } // Paper - OBFHELPER
     protected World world;
diff --git a/src/main/java/net/minecraft/server/TileEntitySign.java b/src/main/java/net/minecraft/server/TileEntitySign.java
index 31a9d45727..458d1561d0 100644
--- a/src/main/java/net/minecraft/server/TileEntitySign.java
+++ b/src/main/java/net/minecraft/server/TileEntitySign.java
@@ -50,13 +50,14 @@ public class TileEntitySign extends TileEntity implements ICommandListener {
             }
 
             try {
-                IChatBaseComponent ichatbasecomponent = IChatBaseComponent.ChatSerializer.a(s);
+                //IChatBaseComponent ichatbasecomponent = IChatBaseComponent.ChatSerializer.a(s); // Paper - move down - the old format might throw a json error
 
-                if (oldSign) {
+                if (oldSign && !isLoadingStructure) { // Paper - saved structures will be in the new format, but will not have isConverted
                     lines[i] = org.bukkit.craftbukkit.util.CraftChatMessage.fromString(s)[0];
                     continue;
                 }
                 // CraftBukkit end
+                IChatBaseComponent ichatbasecomponent = IChatBaseComponent.ChatSerializer.a(s); // Paper - after old sign
 
                 if (this.world instanceof WorldServer) {
                     try {
-- 
2.21.0