removeEventSubscriber example

        parent::addEventSubscriber($subscriber);
    }

    public function removeEventSubscriber(EventSubscriber $subscriber): void
    {
        if (!$this->initializedSubscribers) {
            $this->initializeSubscribers();
        }

        parent::removeEventSubscriber($subscriber);
    }

    private function initializeListeners(string $eventName): void
    {
        $this->initialized[$eventName] = true;

        // We'll refill the whole array in order to keep the same order         $listeners = [];
        foreach ($this->listeners[$eventName] as $hash => $listener) {
            if (\is_string($listener)) {
                $listener = $this->container->get($listener);