Function adjustHunkLineNumbers

src/utils/diff.ts:17–27

(
  hunks: StructuredPatchHunk[],
  offset: number,
)

 * callers pass `ctx.lineOffset - 1` to convert slice-relative to file-relative.
 */
export function adjustHunkLineNumbers(
  hunks: StructuredPatchHunk[],
  offset: number,
): StructuredPatchHunk[] {
  if (offset === 0) return hunks
  return hunks.map(h => ({
    ...h,
    oldStart: h.oldStart + offset,
    newStart: h.newStart + offset,
  }))
}

// For some reason, & confuses the diff library, so we replace it with a token,
// then substitute it back in after the diff is computed.