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 Desktop Packages, which is subscribed to thunderbird in Ubuntu. https://bugs.launchpad.net/bugs/120281 Title: Opening a message from the drafts folder for editing does not remove added linebreaks Status in Mozilla Thunderbird Mail and News: Fix Released Status in “thunderbird” package in Ubuntu: Fix Released Bug description: Binary package hint: mozilla-thunderbird When I open a message for editing in the Drafts folder the linebreaks added by Thunderbird are not removed. The implication of this is that the line wrapping gets screwed up when I edit a paragraph. Steps to reproduce: 1. Create a new message and type in some 100 characters (no line breaks). 2. Save the message. 3. Open the message for editing from the Drafts folder and append a new word at the end of the first line. Result: The paragraph is not wrapped correctly; the appended word is on a line by itself despite not being the last word of the paragraph. Expected result: The appended word should not be on a line by itself since it is not the last word in the paragraph. ProblemType: Bug Architecture: i386 Date: Thu Jun 14 00:21:24 2007 DistroRelease: Ubuntu 7.04 Package: mozilla-thunderbird 1.5.0.12-0ubuntu0.7.04 PackageArchitecture: i386 SourcePackage: mozilla-thunderbird Uname: Linux karlan 2.6.20-16-generic #2 SMP Thu Jun 7 20:19:32 UTC 2007 i686 GNU/Linux To manage notifications about this bug go to: https://bugs.launchpad.net/thunderbird/+bug/120281/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp