PortionText
PortionText Determine how to distribute the slop value for a line Ptr textPtr ; a pointer to the text to be justified long textLen ; specifies the length of the text
returns a fixed "magic number" that is based on the number
of spaces, number of characters, font, size, style,
styleRunPosition value, and the scaling parameters.
The PortionText procedure indicates the correct proportion of justification to be allocated to given text when compared to other text; used to determine
how to distribute the slop of a line among the style runs on the line