From c35f0616fe3d5635d77ee1de19f4cc4f40f108c1 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Wed, 17 Oct 2018 19:17:27 -0400
Subject: [PATCH] MC-50319: Check other worlds for shooter of projectiles

Say a player shoots an arrow through a nether portal, the game
would lose the shooter for determining things such as Player Kills,
because the entity is in another world.

If the projectile fails to find the shooter in the current world, check
other worlds.

diff --git a/src/main/java/net/minecraft/server/EntityProjectile.java b/src/main/java/net/minecraft/server/EntityProjectile.java
index f2f4b2d929..18d28a151a 100644
--- a/src/main/java/net/minecraft/server/EntityProjectile.java
+++ b/src/main/java/net/minecraft/server/EntityProjectile.java
@@ -213,11 +213,21 @@ public abstract class EntityProjectile extends Entity implements IProjectile {
     public EntityLiving getShooter() {
         if (this.shooter == null && this.shooterId != null && this.world instanceof WorldServer) {
             Entity entity = ((WorldServer) this.world).getEntity(this.shooterId);
+            // Paper start - MC-50319 - shooter might be in another world (arrows through portals)
+            if (entity == null) {
+                for (WorldServer world : world.getMinecraftServer().getWorlds()) {
+                    entity = world.getEntity(this.shooterId);
+                    if (entity != null) {
+                        break;
+                    }
+                }
+            }
+            // Paper end
 
             if (entity instanceof EntityLiving) {
                 this.shooter = (EntityLiving) entity;
             } else {
-                this.shooterId = null;
+                //this.shooterId = null; // Paper - don't unset shooterId
             }
         }
 
-- 
2.21.0