Sessions will not be started anymore when reading app.flashes in Twig

[hansgrinwis]

In
https://symfony.com/doc/current/session.html#avoid-starting-sessions-for-anonymous-users
it states that a session will be started when reading app.flashes in a Twig template. However, this specific issue has been resolved in Symfony 3.3, according to
https://symfony.com/blog/new-in-symfony-3-3-improved-flash-messages

[hansgrinwis]

👍 Thanks.