Missing implementation of a boolean in 2D shader tutorial

[zaezae]

2D shader tutorial chapter 5 doesn't implement SceneTransition.IsComplete boolean, which would lead to premature scene transition (next scene starts before screen transition animation finishes). so basically this:

if (s_nextScene != null && SceneTransition.IsComplete)
        {
            TransitionScene();
        }

This seems to be in the tutorial repo, but not mentioned or included in the tutorial.