The fix to #23 seems to have broken reply header handling in emails like this one, containing more reply headers in the quoted text below.

Expected Behavior: The first reply header gets its line breaks removed, and ends up in the second fragment along with all of the quoted text.

Observed Behavior: The line breaks aren't removed, and therefore it's not recognized as a reply header later on. So the reply header ends up in the first fragment instead of the second.