Prevent rayTrace from loading chunks - Fixes #1706

ray tracing into an unloaded chunk should be treated as a miss
this saves a ton of lag for when AI tries to raytrace near unloaded chunks.

Spigot-Server-Patches/0414-Prevent-rayTrace-from-loading-chunks.patch

@@ -0,0 +1,35 @@
+From 9b79efe86e1e92e19577146c85b57c55561b1712 Mon Sep 17 00:00:00 2001
+From: Aikar <aikar@aikar.co>
+Date: Mon, 26 Nov 2018 19:21:58 -0500
+Subject: [PATCH] Prevent rayTrace from loading chunks
+
+ray tracing into an unloaded chunk should be treated as a miss
+this saves a ton of lag for when AI tries to raytrace near unloaded chunks.
+
+diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
+index 027871c00b..00773a9afa 100644
+--- a/src/main/java/net/minecraft/server/World.java
++++ b/src/main/java/net/minecraft/server/World.java
+@@ -860,7 +860,8 @@ public abstract class World implements IEntityAccess, GeneratorAccess, IIBlockAc
+                 int i1 = MathHelper.floor(d1);
+                 int j1 = MathHelper.floor(d2);
+                 BlockPosition blockposition = new BlockPosition(l, i1, j1);
+-                IBlockData iblockdata = this.getType(blockposition);
++                IBlockData iblockdata = this.getTypeIfLoaded(blockposition); // Paper
++                if (iblockdata == null) return null; // Paper
+                 Fluid fluid = this.b(blockposition);
+                 boolean flag2;
+                 boolean flag3;
+@@ -982,7 +983,8 @@ public abstract class World implements IEntityAccess, GeneratorAccess, IIBlockAc
+                     i1 = MathHelper.floor(d1) - (enumdirection == EnumDirection.UP ? 1 : 0);
+                     j1 = MathHelper.floor(d2) - (enumdirection == EnumDirection.SOUTH ? 1 : 0);
+                     blockposition = new BlockPosition(l, i1, j1);
+-                    IBlockData iblockdata1 = this.getType(blockposition);
++                    IBlockData iblockdata1 = this.getTypeIfLoaded(blockposition); // Paper
++                    if (iblockdata1 == null) return null; // Paper
+                     Fluid fluid1 = this.b(blockposition);
+ 
+                     if (!flag || iblockdata1.getMaterial() == Material.PORTAL || !iblockdata1.getCollisionShape(this, blockposition).isEmpty()) {
+-- 
+2.19.1
+