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Returns the length of the current Edit data line for the specified line-ptr. Line-ptr must be a line pointer for a data line, not for a special line.
num-var will be 0 if the line-ptr value is invalid or is not the line pointer of a data line.
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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