Maps byte offset in most recent GetOneScriptSpan/Lower span->text [0..text_bytes] into an additional byte offset from span->offset, to get back to corresponding text in the original input buffer. text_offset must be the first byte of a UTF-8 character, or just beyond the last character. Normally this routine is called with the first byte of an interesting range and again with the first byte of the
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nothing calls this directly
no outgoing calls
no test coverage detected