3.4 dropped Auth.redirect session value. Now AuthComponent::redirectUrl() will return redirect query string value if it is present.
That means when a user calls a link what is behind authentication he will be redirected to the login page. There I should add manually the redirect query string to the login form action property, as it is not added automatically. And if the original link conatined query string I should add it back again?
I do not really see the advantage of this approach, prior to 3.4 all this happened automatically.