Discard Pending LobbyEnter_t on LeaveLobby

Author: LuKeSt0rm

dll/steam_matchmaking.cpp

@@ -686,6 +686,15 @@ void Steam_Matchmaking::LeaveLobby( CSteamID steamIDLobby )
     PRINT_DEBUG_ENTRY();
     std::lock_guard<std::recursive_mutex> lock(global_mutex);
     PRINT_DEBUG("pass mutex");
+
+    // Discard any deferred LobbyEnter_t; no point delivering an enter for a lobby that’s already being left
+    pending_lobby_enters.erase(
+        std::remove_if(pending_lobby_enters.begin(), pending_lobby_enters.end(),
+            [&steamIDLobby](const Pending_Lobby_Enter &p) {
+                return p.lobby_id == steamIDLobby.ConvertToUint64();
+            }),
+        pending_lobby_enters.end());
+
     Lobby *lobby = get_lobby(steamIDLobby);
     if (lobby) {
         if (!lobby->deleted()) {