A family of Microsoft word processing software products for creating web, email, and print documents.
As a professional computer programmer, I think it is safe to say that simply adding a "space" to the end of a text string and treating it as new userIDs is a "boo-boo", not intentional. If they really wanted to highlight the most recent changes, they would use the date-time stamp.
And it is probably so low priority that it will probably never be fixed, inspite of all of the complaints we see here about it. (I hope I am wrong about that guess ... )