It's been a while since I last touched this but I suspect you'd have to have an invisible window on top of the entire display to catch all events and pass them on. I think this is the way spyware for X11 used to be done.
Tzafrir Cohen wrote:
Hi folks
I'm trying to write a small X11 client that will be notified whenever a window loses the input focus and whenever a window gains the input focus?
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