fix 1.21.5 player chat packet

fixes https://github.com/Pumpkin-MC/Pumpkin/issues/677

pumpkin-protocol/src/client/play/player_chat_message.rs

@@ -9,6 +9,7 @@ use crate::{VarInt, codec::bit_set::BitSet};
 #[derive(Serialize)]
 #[packet(PLAY_PLAYER_CHAT)]
 pub struct CPlayerChatMessage {
+    global_index: VarInt,
     #[serde(with = "uuid::serde::compact")]
     sender: uuid::Uuid,
     index: VarInt,
@@ -29,6 +30,7 @@ pub struct CPlayerChatMessage {
 impl CPlayerChatMessage {
     #[expect(clippy::too_many_arguments)]
     pub fn new(
+        global_index: VarInt,
         sender: uuid::Uuid,
         index: VarInt,
         message_signature: Option<Box<[u8]>>,
@@ -43,13 +45,14 @@ impl CPlayerChatMessage {
         target_name: Option<TextComponent>,
     ) -> Self {
         Self {
+            global_index,
             sender,
             index,
             message_signature,
             message,
             timestamp,
             salt,
-            previous_messages_count: previous_messages.len().into(),
+            previous_messages_count: VarInt(previous_messages.len() as i32),
             previous_messages,
             unsigned_content,
             filter_type,

pumpkin/src/entity/player.rs

@@ -233,6 +233,7 @@ pub struct Player {
     pub experience_pick_up_delay: Mutex<u32>,
     pub chunk_manager: Mutex<ChunkManager>,
     pub has_played_before: AtomicBool,
+    pub global_chat_message_index: AtomicU32,
 }
 
 impl Player {
@@ -316,6 +317,7 @@ impl Player {
             last_sent_food: AtomicU32::new(0),
             last_food_saturation: AtomicBool::new(true),
             has_played_before: AtomicBool::new(false),
+            global_chat_message_index: AtomicU32::new(0),
         }
     }
 

pumpkin/src/net/packet/play.rs

@@ -680,6 +680,9 @@ impl Player {
         }
 
         let gameprofile = &self.gameprofile;
+        let global_index = self
+            .global_chat_message_index
+            .fetch_add(1, std::sync::atomic::Ordering::Relaxed);
         send_cancellable! {{
             PlayerChatEvent::new(self.clone(), message.clone(), vec![]);
 
@@ -691,6 +694,7 @@ impl Player {
                     let world = &entity.world.read().await;
                     world
                         .broadcast_packet_all(&CPlayerChatMessage::new(
+                            VarInt(global_index as i32),
                             gameprofile.id,
                             1.into(),
                             chat_message.signature,
@@ -709,6 +713,7 @@ impl Player {
                 } else {
                     let packet =
                         CPlayerChatMessage::new(
+                            VarInt(global_index as i32),
                             gameprofile.id,
                             1.into(),
                             chat_message.signature,