sweep: Set `use_bytes` flag (#43687)

Without this new flag, the Sweep API will actually produce a combination
of UTF-16 and char indices, leading to incorrect edit positions.

Release Notes:

- N/A
77656a4091Agus Zubiaga committed on 11/27/2025, 9:29:42 PM· committed by GitHubparent05b999b
1 file changedLine totals unavailable