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/world/level/block/entity/BlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/BlockEntity.java
index 13115d1b28dfa2d87b45a50bd0feaa7f57769122..d08ed44884726ca2ba4578226b8aa6244778f4c7 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/BlockEntity.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/BlockEntity.java
@@ -34,6 +34,7 @@ public abstract class BlockEntity implements net.minecraft.server.KeyedObject {
     public CraftPersistentDataContainer persistentDataContainer;
     // CraftBukkit end
     private static final Logger LOGGER = LogManager.getLogger();
+    public boolean isLoadingStructure = false; // Paper
     private final BlockEntityType<?> type; public BlockEntityType getTileEntityType() { return type; } // Paper - OBFHELPER
     @Nullable
     protected Level level;
diff --git a/src/main/java/net/minecraft/world/level/block/entity/SignBlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/SignBlockEntity.java
index e747f729326fb3bacfb3f983ac7701c0fb0f0e6a..e4eab82855649fec654c60b2e94ba7b71c2ac5a2 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/SignBlockEntity.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/SignBlockEntity.java
@@ -78,13 +78,14 @@ public class SignBlockEntity extends BlockEntity implements CommandSource { // C
             }
 
             try {
-                MutableComponent ichatmutablecomponent = Component.Serializer.fromJson(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
                     messages[i] = org.bukkit.craftbukkit.util.CraftChatMessage.fromString(s)[0];
                     continue;
                 }
                 // CraftBukkit end
+                MutableComponent ichatmutablecomponent = Component.Serializer.fromJson(s.isEmpty() ? "\"\"" : s); // Paper - after old sign
 
                 if (this.level instanceof ServerLevel) {
                     try {
diff --git a/src/main/java/net/minecraft/world/level/levelgen/structure/templatesystem/StructureTemplate.java b/src/main/java/net/minecraft/world/level/levelgen/structure/templatesystem/StructureTemplate.java
index 8da00ee410e3f8f09b8ac273095a3d22d6c4d92b..d4cf5d3bdbe629081f6ec9d4ea94004560c93ebc 100644
--- a/src/main/java/net/minecraft/world/level/levelgen/structure/templatesystem/StructureTemplate.java
+++ b/src/main/java/net/minecraft/world/level/levelgen/structure/templatesystem/StructureTemplate.java
@@ -278,9 +278,11 @@ public class StructureTemplate {
                                         definedstructure_blockinfo.nbt.putLong("LootTableSeed", random.nextLong());
                                     }
 
+                                    tileentity.isLoadingStructure = true; // Paper
                                     tileentity.load(definedstructure_blockinfo.state, definedstructure_blockinfo.nbt);
                                     tileentity.mirror(placementData.getMirror());
                                     tileentity.rotate(placementData.getRotation());
+                                    tileentity.isLoadingStructure = false; // Paper
                                 }
                             }