From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Yannick Lamprecht <yannicklamprecht@live.de>
Date: Wed, 30 Mar 2022 18:16:52 +0200
Subject: [PATCH] Player Entity Tracking Events


diff --git a/src/main/java/net/minecraft/server/level/ChunkMap.java b/src/main/java/net/minecraft/server/level/ChunkMap.java
index d58c25b639df59212c61bab989a11679852eea26..d20112349868f4c76f43882ad0cab7be025a6303 100644
--- a/src/main/java/net/minecraft/server/level/ChunkMap.java
+++ b/src/main/java/net/minecraft/server/level/ChunkMap.java
@@ -1410,9 +1410,18 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
                 // CraftBukkit end
                 if (flag) {
                     if (this.seenBy.add(player.connection)) {
+                        // Paper start - entity tracking events
+                        if (io.papermc.paper.event.player.PlayerTrackEntityEvent.getHandlerList().getRegisteredListeners().length == 0 || new io.papermc.paper.event.player.PlayerTrackEntityEvent(player.getBukkitEntity(), this.entity.getBukkitEntity()).callEvent()) {
                         this.serverEntity.addPairing(player);
+                        }
+                        // Paper end
                     }
                 } else if (this.seenBy.remove(player.connection)) {
+                    // Paper start - entity tracking events
+                    if (io.papermc.paper.event.player.PlayerUntrackEntityEvent.getHandlerList().getRegisteredListeners().length > 0) {
+                        new io.papermc.paper.event.player.PlayerUntrackEntityEvent(player.getBukkitEntity(), this.entity.getBukkitEntity()).callEvent();
+                    }
+                    // Paper end
                     this.serverEntity.removePairing(player);
                 }