From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: AgentTroll <woodyc40@gmail.com>
Date: Fri, 22 Mar 2019 22:24:03 -0700
Subject: [PATCH] Update entity Metadata for all tracked players


diff --git a/src/main/java/net/minecraft/server/level/ChunkMap.java b/src/main/java/net/minecraft/server/level/ChunkMap.java
index 8311d921ded1c81a1f561dc13db2010d2b7ce5d6..95ac30f56a9268f14d2518974c5a52e08f40ea18 100644
--- a/src/main/java/net/minecraft/server/level/ChunkMap.java
+++ b/src/main/java/net/minecraft/server/level/ChunkMap.java
@@ -1281,6 +1281,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
                 } else {
                     ChunkMap.TrackedEntity playerchunkmap_entitytracker = new ChunkMap.TrackedEntity(entity, i, j, entitytypes.trackDeltas());
 
+                    entity.tracker = playerchunkmap_entitytracker; // Paper - Fast access to tracker
                     this.entityMap.put(entity.getId(), playerchunkmap_entitytracker);
                     playerchunkmap_entitytracker.updatePlayers(this.level.players());
                     if (entity instanceof ServerPlayer) {
@@ -1323,7 +1324,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
         if (playerchunkmap_entitytracker1 != null) {
             playerchunkmap_entitytracker1.broadcastRemoved();
         }
-
+        entity.tracker = null; // Paper - We're no longer tracked
     }
 
     protected void tick() {
diff --git a/src/main/java/net/minecraft/server/level/ServerEntity.java b/src/main/java/net/minecraft/server/level/ServerEntity.java
index ad9bbda31a4cdb306ca40f2b99e4b815c4f136bd..28afe2f238ded241acf77c3272a44068646b9133 100644
--- a/src/main/java/net/minecraft/server/level/ServerEntity.java
+++ b/src/main/java/net/minecraft/server/level/ServerEntity.java
@@ -392,6 +392,12 @@ public class ServerEntity {
         return ClientboundMoveEntityPacket.packetToEntity(this.xp, this.yp, this.zp);
     }
 
+    // Paper start - Add broadcast method
+    void broadcast(Packet<?> packet) {
+        this.broadcast.accept(packet);
+    }
+    // Paper end
+
     private void broadcastAndSend(Packet<?> packet) {
         this.broadcast.accept(packet);
         if (this.entity instanceof ServerPlayer) {
diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index defebf7b45e4f006fa7e575b5dbd01ac1e231d5a..6c4266d847b1181a055fa425d5734032dadabf93 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -2289,7 +2289,14 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Ser
 
                         if (event.isCancelled() || ServerGamePacketListenerImpl.this.player.getInventory().getSelected() == null || ServerGamePacketListenerImpl.this.player.getInventory().getSelected().getItem() != origItem) {
                             // Refresh the current entity metadata
-                            ServerGamePacketListenerImpl.this.send(new ClientboundSetEntityDataPacket(entity.getId(), entity.getEntityData(), true));
+                            // Paper start - update entity for all players
+                            ClientboundSetEntityDataPacket packet1 = new ClientboundSetEntityDataPacket(entity.getId(), entity.getEntityData(), true);
+                            if (entity.tracker != null) {
+                                entity.tracker.broadcast(packet1);
+                            } else {
+                                ServerGamePacketListenerImpl.this.send(packet1);
+                            }
+                            // Paper end
                         }
 
                         if (event.isCancelled()) {
diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
index fcd3e6bfb4b1d0aefcb34eaec1212b08498dd5af..a5159198003e43ce272ae73941d2be47d50eedc9 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -300,6 +300,7 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, n
     public boolean forceExplosionKnockback; // SPIGOT-949
     public boolean persistentInvisibility = false;
     public org.bukkit.Location origin; // Paper
+    public net.minecraft.server.level.ChunkMap.TrackedEntity tracker; // Paper - fast access to tracker
     // Spigot start
     public final org.spigotmc.ActivationRange.ActivationType activationType = org.spigotmc.ActivationRange.initializeEntityActivationType(this);
     public final boolean defaultActivationState;