bug#10019: sort options -Mn are incompatible

[Paul Eggert]

On 11/16/11 09:27, Eric Blake wrote:
> That's what I get for pasting into a Thunderbird compose window

Here's how to shut that annoying feature off:

http://kb.mozillazine.org/Plain_text_e-mail_-_Thunderbird#Flowed_format