NSTextStorage provides attribute fixing of user-entered text, via NSMutableAttributedString.fixAttributes(in:). Attribute fixing… NSMutableAttributedString.fixAttributes(in:) always work on full paragraph ranges. It extends the passed-in range as needed “to cover the last paragraph partially contained”.

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NSAttributedString API takes an NSRange by-reference. That’s cumbersome to use, though, because you need to initialize a non-nil range, and there you should initialize it with NSNotFound to indicate an illegal state. Afterwards, you need to check if the range changed to a legal value.

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