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 58e9c99b44fd8e77e62c4098d9872d5378d4f5e5..8974d7944f159b9346680c639daf0f8c06767cfe 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 da96a91c6b4cc03ad2e4539053bd30e7dc62dfe8..cea42d98aa6e1f96df0fa70234086dceb124fbbf 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 b7c9b356e24a8269ade76738335a63ef18890d4d..2b249e7e2018a283b80b9462fbc129420e47ec06 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 {