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From 303db4ec97a30becab6cf491f99cb91bce5bf752 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Mon, 19 Dec 2016 23:07:42 -0500
Subject: [PATCH] Prevent Pathfinding out of World Border

This prevents Entities from trying to run outside of the World Border

diff --git a/src/main/java/net/minecraft/server/NavigationAbstract.java b/src/main/java/net/minecraft/server/NavigationAbstract.java
index 716d00afb..c55aadb53 100644
--- a/src/main/java/net/minecraft/server/NavigationAbstract.java
+++ b/src/main/java/net/minecraft/server/NavigationAbstract.java
@@ -75,6 +75,7 @@ public abstract class NavigationAbstract {
 
     @Nullable
     public PathEntity b(BlockPosition blockposition) {
+        if (!getEntity().getWorld().getWorldBorder().isInBounds(blockposition)) return null; // Paper - don't path out of world border
         if (!this.b()) {
             return null;
         } else if (this.c != null && !this.c.b() && blockposition.equals(this.q)) {
@@ -101,7 +102,7 @@ public abstract class NavigationAbstract {
             return null;
         } else {
             BlockPosition blockposition = new BlockPosition(entity);
-
+            if (!getEntity().getWorld().getWorldBorder().isInBounds(blockposition)) return null; // Paper - don't path out of world border
             if (this.c != null && !this.c.b() && blockposition.equals(this.q)) {
                 return this.c;
             } else {
diff --git a/src/main/java/net/minecraft/server/WorldBorder.java b/src/main/java/net/minecraft/server/WorldBorder.java
index beac8ac0b..86ada40a1 100644
--- a/src/main/java/net/minecraft/server/WorldBorder.java
+++ b/src/main/java/net/minecraft/server/WorldBorder.java
@@ -19,7 +19,7 @@ public class WorldBorder {
 
     public WorldBorder() {}
 
-    public boolean a(BlockPosition blockposition) {
+    public boolean isInBounds(BlockPosition blockposition) { return a(blockposition); }public boolean a(BlockPosition blockposition) { // Paper - OBFHELPER
         return (double) (blockposition.getX() + 1) > this.b() && (double) blockposition.getX() < this.d() && (double) (blockposition.getZ() + 1) > this.c() && (double) blockposition.getZ() < this.e();
     }
 
-- 
2.20.1