Thank you. The answer it led me too, while counter intuitive, was FocusIn(A widget has gained the keyboard focus) is the 'only' event(at least in the provided tags) that is generated when a window in iconic state becomes visible. Your code helped me to find that!
Please note it had to be modified as the logic you employed does not see an Icon appear in Ubuntu Activities Bar so no user interaction viable to restore it once withdrawn.

In reply to Re^3: Identify Tk state iconic to normal events by WayneRas
in thread Identify Tk state iconic to normal events by WayneRas

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