Folks -

Another quick fix.  Update again to get it.

Fixed problems due to balancedPatternForDepth not working for transparent color.  Also several improvements to handling of rounded corners.  Screen repainting should be faster, and dragging should look nicer.

Enjoy
	- Dan
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1974RoundingTweaks-di -- Dan Ingalls -- 25 March 2000
Makes SystemWindows with rounded corners properly compute areasRemainingToFill:.
Also improves the result reported from this message, as it now only reports two strips with the four corners, rather than the entire window.
Most importantly, it fixes the general problem of canvas holes being filled with gray stipple when dragging with the Hand in 8-bit depth.