REG: Modal QuickWindow is not visible after show

Bug is that QQuickWindow is launched as Application/WindowModal from the widget and it's not visible after show. Test application attached. Works in Qt 5.2.1.

Qt 5.2.1
1 )run the application
2) click on the push me button and notice a red box animate open
3) hitting escape will close the red box

Qt 5.3.0
1)run the application
2)You will notice the same red box isn't visible. Once you move the mouse outside the window, you will notice the red box becomes visible and starts to animate open.

Looks like exact regression is between v5.3.0-alpha1 and v5.3.0-beta1.