emberjs/ember.js — comment on commit 9050fabac7f7b3e302893ce3312d241805514ee0
File:  line 0
By wycats:

The `state` property was never public API. You should be using `didInsertElement` to know if a view is inserted into the DOM. We recently made a change that makes it possible to do: `view.on('didInsertElement', callback)` if you want to observe `didInsertElement` on a view without adding a callback method.