After all these years, I finally found that I was still experiencing this bug (see my comment 88) because of the addon Enigmail, that automatically sets "mailnews.send_plaintext_flowed" to "false".
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/120281 Title: Opening a message from the drafts folder for editing does not remove added linebreaks To manage notifications about this bug go to: https://bugs.launchpad.net/thunderbird/+bug/120281/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
