getPreviousToken example

    public function onSuccessfulLogin(LoginSuccessEvent $event): void
    {
        $request = $event->getRequest();
        $token = $event->getAuthenticatedToken();

        if (!$request->hasPreviousSession()) {
            return;
        }

        if ($previousToken = $event->getPreviousToken()) {
            $user = $token->getUserIdentifier();
            $previousUser = $previousToken->getUserIdentifier();

            if ('' !== ($user ?? '') && $user === $previousUser) {
                return;
            }
        }

        $this->sessionAuthenticationStrategy->onAuthentication($request, $token);
    }