I found that I can call the NSLayoutManager methods for modifying
glyph storage (replaceGlyphAtIndex:withGlyph:,
insertGlyph:atGlyphIndex:characterIndex:, etc.) without errors if I
place the code in an override of NSATSTypesetter -
beginLineWithGlyphAtIndex: and inform the typesetter of any change in
glyph count by calling setParagraphGlyphRange:separatorGlyphRange:.
Ross
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