The scan pointer was advanced with utf8_next_char(), which blindly skips utf8_skip_data[lead byte] bytes, so a line ending in a truncated multibyte sequence like "foo\xF0" stepped over the NUL and the loop read past the end of the string. Decode each character with utf8_encoded_to_unichar() and propagate the error instead of measuring broken characters. Fixes #43052.
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