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Re: CLX design issues

   > 	Exposing the value-mask component of :configure-request is not the best Lisp
   > 	interface.
   > I don't understand this enough.

The :configure-request event is sent when redirecting ConfigureWindow
requests.  The value-mask contains a 1 bit for each window geometry component
(x, y, width, height, border-width, stack-mode, above-sibling) that was
changed in the redirected ConfigureWindow request. The problem is that there's
no way specified for a CLX program to decode this bit mask.

The best solution was proposed by RWS: treat value-mask like event-mask, with
new functions (make-value-mask, make-value-keys) to convert between the
bitmask and set-of-keywords representations.