widget-inactive face unusable

[Lennart Borgman]

I found the face widget-inactive unusable, at least on w32. Can anyone 
see the difference between active and inactive buttons in Custom?

It is currently defined as

(defface widget-inactive '((((class grayscale color)
                (background dark))
               (:foreground "light gray"))
              (((class grayscale color)
                (background light))
               (:foreground "dim gray"))
              (t
               (:slant italic)))
 "Face used for inactive widgets."
 :group 'widget-faces)
;; backward-compatibility alias
(put 'widget-inactive-face 'face-alias 'widget-inactive)

I get the "dim gray" foreground. I do not know what "dim" stands for but 
removing it gives me a more useful color. The widget label is now really 
gray. (However it might even be too hard to read.)

How does it look on other platforms? Can we change it to something useful?