change room host when host leave

gframe/single_duel.cpp

@@ -179,9 +179,22 @@ void SingleDuel::JoinGame(DuelPlayer* dp, void* pdata, bool is_creater) {
 }
 void SingleDuel::LeaveGame(DuelPlayer* dp) {
 	if(dp == host_player) {
+		int host_pos;
+		if(players[0] && dp->type != 0) {
+			host_pos = 0;
+			host_player = players[0];
+		} else if(players[1] && dp->type != 1) {
+			host_pos = 1;
+			host_player = players[1];
+		} else {
 			EndDuel();
 			NetServer::StopServer();
-	} else if(dp->type == NETPLAYER_TYPE_OBSERVER) {
+		}
+		STOC_TypeChange sctc;
+		sctc.type = 0x10 | host_pos;
+		NetServer::SendPacketToPlayer(players[host_pos], STOC_TYPE_CHANGE, sctc);
+	}
+	if(dp->type == NETPLAYER_TYPE_OBSERVER) {
 		observers.erase(dp);
 		if(!pduel) {
 			STOC_HS_WatchChange scwc;