From 0000000000000000000000000000000000000000 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 9eed1dce3e48683b751ebbaac0487a046354622e..6c091b68087d60b0b916871eb0ce06c6a2776bf8 100644
--- a/src/main/java/net/minecraft/server/EntityProjectile.java
+++ b/src/main/java/net/minecraft/server/EntityProjectile.java
@@ -209,6 +209,16 @@ public abstract class EntityProjectile extends Entity implements IProjectile {
     public EntityLiving getShooter() {
         if ((this.shooter == null || this.shooter.dead) && 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;
