Re: @John Robinson
>They track changes on texts.
Not in the way Word does. Track Changes doesn't mean "find the diffs and blames", it means "show all editorial comments in a different style, show content diffs, and get rid of everything except the final raw copy when editing is done."
You could probably hack together a script to do it, but only insane people try to write a book using a code IDE.
(Actually I believe some tech publishers use a tech workflow and will accept copy in - e.g. - MD, but that won't work for most writers.)