I have made extensive comments on a document - e.g. inserted a whole new paragraph as a "text insertion" comment. My collaborator wants to alter those comments - e.g. delete a sentence from one of my new paragraphs. He can do this, but the change is not obviously flagged up. Is there
a) a way to "change track" comments, or
b) a way to take two lists of almost-similar comments (say as fdf exported files), and compare the comments against each other, to look for inserted/deleted sections?