Was #8763 by @zdravkov — moved here since no reply yet and we can get this in now.
Break all long words within comments, fixes #7261
Test live: https://calypso.live/?branch=fix/7261-post-comment-wordbreak
After testing this more, the final result is worse... :(
You end up with fragments at the end of each line instead of nice breaks for normal words.
This solution creates more problems than it fixes, unfortunately. I think we shouldn't make the change at this time.