Returns the bounding rectangle enclosing the given text block containing the given glyph range.
- macOS 10.4+
The text block whose bounds rectangle is returned.
The range of glyphs in the text block.
The bounding rectangle, or
NSZero if no rectangle has been set for the specified block since the last invalidation
This method causes glyph generation but not layout. Block layout rectangles and bounds rectangles are always in container coordinates.