Subscription will receive same event in some edge case

[stardarLeung]

Describe the issue version： 5.0.0+1 lib/src/links/websocket_link/websocket_client.dart at line 365 sub = waitForConnectedState.listen...... at line 241 if (_connectionWasLost) { for (final s in _subscriptionInitializers.values) { s.callback(); // (onListen()) } _connectionWasLost = false; } If socket disconnected when fetch subscribe,onListen will trigger again so that waitForConnectedState will have two or more listener. When socket reconnected, two or more listener will do something same cause subscription receive same event from socket. My solution is cancel listener like sub?.cancel() after add listener to waitForConnectedState.