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I use XGetWindowAttributes to get window's map
state.
There are 3 state: IsUnmapped, IsUnViewable,
IsViewable.
what's the difference among them. Does Mapped window is
viewable? If yes, IsUnviewable means what?
I search the xlib functions, but failed to find one to be used
to changed window's map state directly. Does such a function exist?
Otherwise, How can I know the window's map state is changed if not using
XGetWindowAttributes each time before wondering the map state
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