The lines that are being wrapped have hundreds of words in them. I am using SlickEdit not only to write code, but also regular text for things like blog posts. In a regular text paragraph, I might have two hundred lines without a carriage-return character. In the older version of SlickEdit, SlickEdit Pro 2015 (v20.0.3.0 64-bit), in a backup history comparison window, the text files will wrap properly. I have attached a screenshot of what I see with the older version. You can try the same experiment with the latest version of SlickEdit and you will see that the word-wrap feature does not work in the history comparison window.