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Returns the current color control line data for the specified line-ptr. Line-ptr must be a line pointer for a data line.
str-var will be "" ( zero-length string) if the line-ptr value is invalid.
RC will be 0 and Msg$ will be "" (Null) for successful completion
RC will be 8 and Msg$ set to an error message on failure (e.g. invalid line-ptr)
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