Add check for windows being #f.
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@ -295,8 +295,11 @@
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(window-path dpy p)))))
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(define (window-viewable? dpy window)
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(eq? (window-attribute:map-state (get-window-attributes dpy window))
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(map-state is-viewable)))
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(and window
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(let ((attrs (get-window-attributes dpy window)))
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(and attrs
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(eq? (window-attribute:map-state attrs)
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(map-state is-viewable))))))
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(define (window-mapped? dpy window)
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(and window
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