option to disable spectator change packet

build-data/divinemc.at

@@ -6,6 +6,7 @@ private-f net.minecraft.world.level.levelgen.NoiseChunk$FlatCache noiseFiller
 private-f net.minecraft.world.level.levelgen.NoiseChunk$NoiseInterpolator noiseFiller
 private-f net.minecraft.world.level.levelgen.RandomState router
 private-f net.minecraft.world.level.levelgen.RandomState sampler
+public net.minecraft.server.level.ServerPlayerGameMode gameModeForPlayer
 public net.minecraft.util.Mth SIN
 public net.minecraft.world.entity.ai.Brain sensors
 public net.minecraft.world.entity.ai.memory.NearestVisibleLivingEntities lineOfSightTest

divinemc-server/minecraft-patches/features/0080-Do-not-send-spectator-change-packet.patch

@@ -0,0 +1,70 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: NONPLAYT <76615486+NONPLAYT@users.noreply.github.com>
+Date: Sun, 20 Jul 2025 00:09:31 +0300
+Subject: [PATCH] Do not send spectator change packet
+
+
+diff --git a/net/minecraft/server/level/ServerPlayerGameMode.java b/net/minecraft/server/level/ServerPlayerGameMode.java
+index 6e7ed7451a45f4525946563617ccf0a55851449b..6a2f8a798f46b337d611c14556ab5ecc1f2584cd 100644
+--- a/net/minecraft/server/level/ServerPlayerGameMode.java
++++ b/net/minecraft/server/level/ServerPlayerGameMode.java
+@@ -75,10 +75,18 @@ public class ServerPlayerGameMode {
+             // CraftBukkit end
+             this.setGameModeForPlayer(gameModeForPlayer, this.gameModeForPlayer); // Paper - Fix MC-259571
+             this.player.onUpdateAbilities();
+-            this.level
+-                .getServer()
+-                .getPlayerList()
+-                .broadcastAll(new ClientboundPlayerInfoUpdatePacket(ClientboundPlayerInfoUpdatePacket.Action.UPDATE_GAME_MODE, this.player), this.player); // CraftBukkit
++
++            // DivineMC start - Do not send spectator change packet
++            if (!org.bxteam.divinemc.config.DivineConfig.NetworkCategory.sendSpectatorChangePacket) {
++                this.level.getServer().getPlayerList().broadcastPlayerInfoWithoutSpectatorName(this.player);
++            } else {
++                this.level
++                    .getServer()
++                    .getPlayerList()
++                    .broadcastAll(new ClientboundPlayerInfoUpdatePacket(ClientboundPlayerInfoUpdatePacket.Action.UPDATE_GAME_MODE, this.player), this.player);
++            }
++            // DivineMC end - Do not send spectator change packet
++
+             this.level.updateSleepingPlayerList();
+             if (gameModeForPlayer == GameType.CREATIVE) {
+                 this.player.resetCurrentImpulseContext();
+diff --git a/net/minecraft/server/players/PlayerList.java b/net/minecraft/server/players/PlayerList.java
+index 96af2c75b526c59510965665da0b2ca00bf657b3..b59078273bb6214295a448d5607538557d7eb1ee 100644
+--- a/net/minecraft/server/players/PlayerList.java
++++ b/net/minecraft/server/players/PlayerList.java
+@@ -1473,4 +1473,32 @@ public abstract class PlayerList {
+     public boolean isAllowCommandsForAllPlayers() {
+         return this.allowCommandsForAllPlayers;
+     }
++
++    // DivineMC start - Do not send spectator change packet
++    public void broadcastPlayerInfoWithoutSpectatorName(ServerPlayer player) {
++        net.minecraft.world.level.GameType displayMode = player.gameMode.getGameModeForPlayer() == net.minecraft.world.level.GameType.SPECTATOR ? net.minecraft.world.level.GameType.SURVIVAL : player.gameMode.getGameModeForPlayer();
++
++        for (ServerPlayer otherPlayer : this.players) {
++            if (otherPlayer != player && otherPlayer.getBukkitEntity().canSee(player.getBukkitEntity())) {
++                ClientboundPlayerInfoUpdatePacket packet = createPlayerInfoPacketWithoutSpectatorName(player, displayMode);
++                otherPlayer.connection.send(packet);
++            }
++        }
++    }
++
++    private ClientboundPlayerInfoUpdatePacket createPlayerInfoPacketWithoutSpectatorName(ServerPlayer player, net.minecraft.world.level.GameType displayMode) {
++        net.minecraft.world.level.GameType originalMode = player.gameMode.gameModeForPlayer;
++
++        player.gameMode.gameModeForPlayer = displayMode;
++
++        ClientboundPlayerInfoUpdatePacket packet = new ClientboundPlayerInfoUpdatePacket(
++            ClientboundPlayerInfoUpdatePacket.Action.UPDATE_GAME_MODE,
++            player
++        );
++
++        player.gameMode.gameModeForPlayer = originalMode;
++
++        return packet;
++    }
++    // DivineMC end - Do not send spectator change packet
+ }

divinemc-server/src/main/java/org/bxteam/divinemc/config/DivineConfig.java

@@ -767,6 +767,7 @@ public class DivineConfig {
         public static boolean optimizeNonFlushPacketSending = false;
         public static boolean disableDisconnectSpam = false;
         public static boolean dontRespondPingBeforeStart = true;
+        public static boolean sendSpectatorChangePacket = true;
         public static boolean playerProfileResultCachingEnabled = true;
         public static int playerProfileResultCachingTimeout = 1440;
 
@@ -803,6 +804,8 @@ public class DivineConfig {
                 "Prevents players being disconnected by 'disconnect.spam' when sending too many chat packets");
             dontRespondPingBeforeStart = getBoolean(ConfigCategory.NETWORK.key("general.dont-respond-ping-before-start"), dontRespondPingBeforeStart,
                 "Prevents the server from responding to pings before the server is fully booted.");
+            sendSpectatorChangePacket = getBoolean(ConfigCategory.NETWORK.key("general.send-spectator-change-packet"), sendSpectatorChangePacket,
+                "When disabled, tab list will not show that the player have entered the spectator mode. Otherwise, it will act as normal spectator change packet.");
 
             playerProfileResultCachingEnabled = getBoolean(ConfigCategory.NETWORK.key("player-profile-result-caching.enabled"), playerProfileResultCachingEnabled,
                 "Enables caching of player profile results on first join.");