From 8a759c74c907ac2ebcf728713d0ed75b2de12353 Mon Sep 17 00:00:00 2001
From: "NG (Graham)" <ngniusness@gmail.com>
Date: Sun, 4 Jan 2026 17:22:11 -0500
Subject: [PATCH] Avoid adding a user to a chat channel more than once

---
 rc_chat_room/src/state/chat/room.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/rc_chat_room/src/state/chat/room.rs b/rc_chat_room/src/state/chat/room.rs
index 3b4f2f9..62434be 100644
--- a/rc_chat_room/src/state/chat/room.rs
+++ b/rc_chat_room/src/state/chat/room.rs
@@ -79,7 +79,11 @@ impl ChatRoom {
                     channel: crate::events::room_join::RoomJoined::CHANNEL,
                     reliable: true,
         });
-        self.online_users.push(handle);
+        if !self.online_users.iter().any(|other| other.name() == handle.name()) {
+            self.online_users.push(handle);
+        } else {
+            log::warn!("User {} tried to join channel {} again", handle.name(), self.name);
+        }
     }
 
     pub fn remove_user(&mut self, name: &str) -> bool {