Test for a grapheme boundary before UTF-16 index position using SFML's Unicode rules. The start and end are boundaries; the middle of a surrogate pair is not. Isolated surrogate code units are treated as U+FFFD.
text
position
position is not an integer from 0 to text.length.
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Test for a grapheme boundary before UTF-16 index position using SFML's Unicode rules. The start and end are boundaries; the middle of a surrogate pair is not. Isolated surrogate code units are treated as U+FFFD.