Detecting obscured windows

Hi all,

I'm currently writing an application, which, at certain times, must be
sure that the user can see what it is doing, or halt the
proceedure.  Basically, is there any way in which you can detect a user
obscuring a window?
I understand that you could check the GdkVisibilityState, but is there a
more convenient way?  Does the widget emit a signal or event when it is
partially covered?



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