From 0000000000000000000000000000000000000000 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 637632b1324e2cdc80cecc4a5a94dc9379312f30..05aae52e662f7effbfb358a5fa6e33c3c4d86001 100644
--- a/src/main/java/net/minecraft/server/DefinedStructure.java
+++ b/src/main/java/net/minecraft/server/DefinedStructure.java
@@ -242,9 +242,11 @@ public class DefinedStructure {
                                         definedstructure_blockinfo.c.setLong("LootTableSeed", random.nextLong());
                                     }
 
+                                    tileentity.isLoadingStructure = true; // Paper
                                     tileentity.load(definedstructure_blockinfo.b, definedstructure_blockinfo.c);
                                     tileentity.a(definedstructureinfo.c());
                                     tileentity.a(definedstructureinfo.d());
+                                    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 534295965ee701611b5e12a10f14a69e8226376a..5e5bb5aaa3d8f4e8f4b00ba8bee059ec79f82b43 100644
--- a/src/main/java/net/minecraft/server/TileEntity.java
+++ b/src/main/java/net/minecraft/server/TileEntity.java
@@ -20,6 +20,7 @@ public abstract class TileEntity implements KeyedObject { // Paper
     public CraftPersistentDataContainer persistentDataContainer;
     // CraftBukkit end
     private static final Logger LOGGER = LogManager.getLogger();
+    boolean isLoadingStructure = false; // Paper
     private final TileEntityTypes<?> tileType; public TileEntityTypes getTileEntityType() { return tileType; } // Paper - OBFHELPER
     @Nullable
     protected World world;
diff --git a/src/main/java/net/minecraft/server/TileEntitySign.java b/src/main/java/net/minecraft/server/TileEntitySign.java
index b7b7d8966ed3390cb828cdd08e4e12d75024d784..8e77c662f7d970d8ff86f6c5b9bccc598442594d 100644
--- a/src/main/java/net/minecraft/server/TileEntitySign.java
+++ b/src/main/java/net/minecraft/server/TileEntitySign.java
@@ -59,13 +59,14 @@ public class TileEntitySign extends TileEntity implements ICommandListener { //
             }
 
             try {
-                IChatMutableComponent ichatmutablecomponent = IChatBaseComponent.ChatSerializer.a(s.isEmpty() ? "\"\"" : s);
+                //IChatMutableComponent ichatmutablecomponent = IChatBaseComponent.ChatSerializer.a(s.isEmpty() ? "\"\"" : 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
+                IChatMutableComponent ichatmutablecomponent = IChatBaseComponent.ChatSerializer.a(s.isEmpty() ? "\"\"" : s); // Paper - after old sign
 
                 if (this.world instanceof WorldServer) {
                     try {