[color] add a note to the documentation to specify the values of the alpha
The alpha channel is fully opaque at 255 and fully transparent at 0.
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@ -31,6 +31,8 @@
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*
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* A #ClutterColor is expressed as a 4-tuple of values ranging from
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* zero to 255, one for each color channel plus one for the alpha.
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*
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* The alpha channel is fully opaque at 255 and fully transparent at 0.
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*/
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#ifdef HAVE_CONFIG_H
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