Fix O(n²) text cursor search with UTF-8 aware O(n) #6
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−10
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This replaces byte-by-byte substring with incremental codepoint width accumulation. Performance: 1000-char textfield click ~1M string ops -> ~1K lookups. Cursor now guaranteed to land on valid UTF-8 codepoint boundaries.
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This replaces byte-by-byte substring with incremental codepoint width accumulation.
Performance: 1000-char textfield click ~1M string ops -> ~1K lookups. Cursor now guaranteed to land on valid UTF-8 codepoint boundaries.