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 9f314204b..23da9467e 100644
--- a/src/main/java/net/minecraft/server/DefinedStructure.java
+++ b/src/main/java/net/minecraft/server/DefinedStructure.java
@@ -0,0 +0,0 @@ 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
                             }
                         }
                     }
@@ -0,0 +0,0 @@ public class DefinedStructure {
         public IBlockData a(int i) {
             IBlockData iblockdata = (IBlockData) this.b.fromId(i);
 
-            return iblockdata == null ? DefinedStructure.a.a : iblockdata;
+            return iblockdata == null ? a : iblockdata; // Paper - decompile error - Blocks.AIR.getBlockData()
         }
 
         public Iterator<IBlockData> iterator() {
diff --git a/src/main/java/net/minecraft/server/TileEntity.java b/src/main/java/net/minecraft/server/TileEntity.java
index 65297a761..537e4b155 100644
--- a/src/main/java/net/minecraft/server/TileEntity.java
+++ b/src/main/java/net/minecraft/server/TileEntity.java
@@ -0,0 +0,0 @@ import org.bukkit.inventory.InventoryHolder; // CraftBukkit
 public abstract class TileEntity {
 
     public Timing tickTimer = MinecraftTimings.getTileEntityTimings(this); // Paper
+    boolean isLoadingStructure = false; // Paper
     private static final Logger a = LogManager.getLogger();
     private static final RegistryMaterials<MinecraftKey, Class<? extends TileEntity>> f = new RegistryMaterials();
     protected World world;
diff --git a/src/main/java/net/minecraft/server/TileEntitySign.java b/src/main/java/net/minecraft/server/TileEntitySign.java
index 77a7b4458..54b719d91 100644
--- a/src/main/java/net/minecraft/server/TileEntitySign.java
+++ b/src/main/java/net/minecraft/server/TileEntitySign.java
@@ -0,0 +0,0 @@ public class TileEntitySign extends TileEntity {
             }
 
             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
 
                 try {
                     this.lines[i] = ChatComponentUtils.filterForDisplay(icommandlistener, ichatbasecomponent, (Entity) null);
--