Torbjörn Andersson d7296ae666 Make it so that if the new cursor palette to be set has zero colours, the
cursor palette is disabled.

Also, when replacing a cursor palette, try to re-use the old palette buffer, as
a minor optimization. (Not that these functions should need any optimization,
but it's simple and shouldn't hurt.)

svn-id: r22554
2006-05-21 13:27:18 +00:00
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