PaperMC/patches/server/0895-Use-single-player-info-update-packet-on-join.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Sun, 8 Jan 2023 17:38:28 -0800
Subject: [PATCH] Use single player info update packet on join


diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index 23fe6877cadd780f4db99955fd993e1461a21040..00855a1e3519a43ab5b203cf0313b297baa254a0 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -3425,7 +3425,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
         this.signedMessageDecoder = session.createMessageDecoder(this.player.getUUID());
         this.chatMessageChain.append(() -> {
             this.player.setChatSession(session);
-            this.server.getPlayerList().broadcastAll(new ClientboundPlayerInfoUpdatePacket(EnumSet.of(ClientboundPlayerInfoUpdatePacket.Action.INITIALIZE_CHAT), List.of(this.player)));
+            this.server.getPlayerList().broadcastAll(new ClientboundPlayerInfoUpdatePacket(EnumSet.of(ClientboundPlayerInfoUpdatePacket.Action.INITIALIZE_CHAT), List.of(this.player)), this.player); // Paper
         });
     }
 
diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java
index 85ed7d2134902e2b3455efdb0defbbc8627933bf..a9cc3d7213f51a2a2cdc915fd9ab3cf97767b698 100644
--- a/src/main/java/net/minecraft/server/players/PlayerList.java
+++ b/src/main/java/net/minecraft/server/players/PlayerList.java
@@ -358,6 +358,7 @@ public abstract class PlayerList {
         // CraftBukkit start - sendAll above replaced with this loop
         ClientboundPlayerInfoUpdatePacket packet = ClientboundPlayerInfoUpdatePacket.createPlayerInitializing(List.of(player));
 
+        final List<ServerPlayer> onlinePlayers = Lists.newArrayListWithExpectedSize(this.players.size() - 1); // Paper - use single player info update packet
         for (int i = 0; i < this.players.size(); ++i) {
             ServerPlayer entityplayer1 = (ServerPlayer) this.players.get(i);
 
@@ -365,12 +366,17 @@ public abstract class PlayerList {
                 entityplayer1.connection.send(packet);
             }
 
-            if (!bukkitPlayer.canSee(entityplayer1.getBukkitEntity())) {
+            if (entityplayer1 == player || !bukkitPlayer.canSee(entityplayer1.getBukkitEntity())) { // Paper - don't include joining player
                 continue;
             }
 
-            player.connection.send(ClientboundPlayerInfoUpdatePacket.createPlayerInitializing(List.of(entityplayer1)));
+            onlinePlayers.add(entityplayer1); // Paper - use single player info update packet
         }
+        // Paper start - use single player info update packet
+        if (!onlinePlayers.isEmpty()) {
+            player.connection.send(ClientboundPlayerInfoUpdatePacket.createPlayerInitializing(onlinePlayers));
+        }
+        // Paper end
         player.sentListPacket = true;
         player.supressTrackerForLogin = false; // Paper
         ((ServerLevel)player.level()).getChunkSource().chunkMap.addEntity(player); // Paper - track entity now