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CFString: implement CFStringGetLineBounds and CFStringGetParagraphBounds - #90
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Both functions were stubs that left their output indices untouched. Scan outward from the range to the enclosing line or paragraph. A line ends at U+000A, U+000D, CRLF, U+0085, U+2028 or U+2029; a paragraph ends only at U+000A, U+000D, CRLF or U+2029.
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CFStringGetLineBounds and CFStringGetParagraphBounds were stubs that returned
without setting their output indices. They now scan outward from the range to the
enclosing line or paragraph and report the begin, end and contents-end indices,
treating CRLF as a single terminator. A line ends at U+000A, U+000D, CRLF, U+0085,
U+2028 or U+2029; a paragraph ends only at U+000A, U+000D, CRLF or U+2029.
Verified against Apple CoreFoundation.