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Before this change, parse_color() and is_valid_color() behaved slightly
differently: parse_color() accepted both colors with and without alpha,
with optional leading #, while is_valid_color() forbade alpha and required
a leading # character. This commit merges the two functions into one
simpler function that forbids alpha and allows an optional leading #.
(Alpha values are forbidden because backgrounds should be opaque; a
leading # is optional to make shell scripts easier to write.)
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