The second patch depends on the first one, without which the new 
test will fail. So I decided to submit both together. Please let 
me know if it is better to file another report.

Thanks!

Cheers,
Pengji

PS I have sent an email to assign@gnu.org, but have not got a 
response yet. I think I have not finished the copyright assignment 
process?

[1] https://git.savannah.gnu.org/cgit/emacs.git/tree/lisp/mail/flow-fill.el#n77