unity hides minimize event from application

According to the gtk documentation, and application should receive a window-state-event notification when the main window is minimized. The window's state should also indicate that it is now iconified. Unity does not deliver this notification to the application or change the window's state to indicate that it has happened.

I am attaching a simple helloworld app with a window-state-event handler. It should print "window state event occurred" to the terminal when the window is minimized. It does so with other window managers (xfce, lxde, metacity) but not with unity.