Returns whether the line being laid out should be broken by a word break at the specified character.
- macOS 10.4+
The index of the character just after the proposed word break would occur.
true if the line should be broken by a word break,
The typesetter calls this method, if implemented by a subclass, before breaking a line by word wrapping before the character at
char, enabling the subclass to control line breaking.
A subclass can override this method to customize the text layout process. If the method returns
false, the typesetter continues looking for a break point.