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.

Spigot-Server-Patches/0395-MC-50319-Check-other-worlds-for-shooter-of-projectil.patch

@@ -0,0 +1,42 @@
+From d6423d5e60baa126e36ae5a5dddca163a36992d6 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 dd8af4be80..b4a5bc600f 100644
+--- a/src/main/java/net/minecraft/server/EntityProjectile.java
++++ b/src/main/java/net/minecraft/server/EntityProjectile.java
+@@ -250,11 +250,21 @@ 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
+             }
+         }
+ 
+-- 
+2.19.1
+