Add async check we potentially missed

CraftBukkit-Patches/0007-Async-Operation-Catching.patch

@@ -1,4 +1,4 @@
-From a7ba30126f1319ecf227bf7b83384c7c77494ea6 Mon Sep 17 00:00:00 2001
+From 2e912ff97691c86ff0778304e3428423b57fc266 Mon Sep 17 00:00:00 2001
 From: md_5 <md_5@live.com.au>
 Date: Thu, 7 Mar 2013 20:12:46 +1100
 Subject: [PATCH] Async Operation Catching
@@ -26,7 +26,7 @@ index 9e2b76f..d7efe3e 100644
              EntityPlayer entityplayer = (EntityPlayer) entity;
              Iterator iterator = this.b.iterator();
 diff --git a/src/main/java/net/minecraft/server/EntityTrackerEntry.java b/src/main/java/net/minecraft/server/EntityTrackerEntry.java
-index 65cc4e8..970a834 100644
+index 5c03732..5f3c780 100644
 --- a/src/main/java/net/minecraft/server/EntityTrackerEntry.java
 +++ b/src/main/java/net/minecraft/server/EntityTrackerEntry.java
 @@ -286,6 +286,7 @@ public class EntityTrackerEntry {
@@ -46,7 +46,7 @@ index 65cc4e8..970a834 100644
              this.trackedPlayers.remove(entityplayer);
              entityplayer.removeQueue.add(Integer.valueOf(this.tracker.id));
 diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
-index f5730d3..af85d8b 100644
+index 319170a..69ef160 100644
 --- a/src/main/java/net/minecraft/server/World.java
 +++ b/src/main/java/net/minecraft/server/World.java
 @@ -918,6 +918,7 @@ public abstract class World implements IBlockAccess {
@@ -65,8 +65,16 @@ index f5730d3..af85d8b 100644
          entity.die();
          if (entity instanceof EntityHuman) {
              this.players.remove(entity);
+@@ -2440,6 +2442,7 @@ public abstract class World implements IBlockAccess {
+     }
+ 
+     public void a(List list) {
++        if (Thread.currentThread() != MinecraftServer.getServer().primaryThread) throw new IllegalStateException("Asynchronous entity world add!"); // Spigot
+         // CraftBukkit start
+         Entity entity = null;
+         for (int i = 0; i < list.size(); ++i) {
 diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
-index a303090..f5e63f8 100644
+index 68fd274..9e7d8ab 100644
 --- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
 +++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
 @@ -235,6 +235,7 @@ public class CraftWorld implements World {