From 5c09f39b2cf1a6c4c976c3902ac4ed220e99b893 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Fri, 18 Mar 2016 14:19:19 -0400
Subject: [PATCH] Undead horse leashing

default false to match vanilla, but option to allow undead horse types to be leashed.

diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
index 06417c8250..66243835a5 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -209,4 +209,9 @@ public class PaperWorldConfig {
     private void nonPlayerEntitiesOnScoreboards() {
         nonPlayerEntitiesOnScoreboards = getBoolean("allow-non-player-entities-on-scoreboards", false);
     }
+
+    public boolean allowLeashingUndeadHorse = false;
+    private void allowLeashingUndeadHorse() {
+        allowLeashingUndeadHorse = getBoolean("allow-leashing-undead-horse", false);
+    }
 }
diff --git a/src/main/java/net/minecraft/server/EntityHorseAbstract.java b/src/main/java/net/minecraft/server/EntityHorseAbstract.java
index fc89cc89a4..953277631a 100644
--- a/src/main/java/net/minecraft/server/EntityHorseAbstract.java
+++ b/src/main/java/net/minecraft/server/EntityHorseAbstract.java
@@ -113,7 +113,7 @@ public abstract class EntityHorseAbstract extends EntityAnimal implements IInven
     }
 
     public boolean a(EntityHuman entityhuman) {
-        return super.a(entityhuman) && this.getMonsterType() != EnumMonsterType.UNDEAD;
+        return world.paperConfig.allowLeashingUndeadHorse ? super.a(entityhuman) : super.a(entityhuman) && this.getMonsterType() != EnumMonsterType.UNDEAD; // Paper
     }
 
     protected void u(float f) {
-- 
2.21.0