EditorWindow.update () is not called

From getting to Unity5, when UnityEditor is inactive, it is no longer called EditorWindow.Update () is.
By using EditorWindow to have created a tool, the UnityEditor is no longer called the Update become background () to very troubled due to such data generation process stops.
Do Update as of Unity4.6.x () is called at any time, you will be required, such as at any time additional option called.

How to check
1. Sample project
2. Window -> to display the window in the "Test Editor Window".
3. If UnityEditor is active, Update () is a display that was called at one-second intervals.
4. Transfer the focus to another application, waiting waiting several tens of seconds.
5. When you move the focus to the Test Editor Window of UnityEdtor, log while the focus is moved to other apps it can be seen that that does not appear.