XEmacs returns the wrong values for display-color-cells

[Jeff Sparkes]

(display-color-cells) returns 256 on my 24 bit X display.  It returns 0 on
ms-windows.  (It also returns 256 on gtk devices).
What's happening is that it's returning the size of the default colormap,
not largest possible one.
I made it return a float to avoid overflow with a 32 bit depth display.

-- 
Jeff Sparkes
jsparkes at gmail.com
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