existing file content overlay. One or more ranges
      of text are deleted from the old file content overlay and replaced with
      new text.
    </p>
    <p>
      The edits are applied in the order in which they occur in the list. This
      means that the offset of each edit must be correct under the assumption
      that all previous edits have been applied.
    </p>
    <p>
      It is an error to use this overlay on a file that does not yet have a file
      content overlay or that has had its overl