Thunderbird 31.6.0 sometimes fails to word wrap properly

Question

Text lines sometimes fail to word wrap properly. Example: a sentence that contains the words "foggy bottom" , where the "foggy" is at the end of one line (when composing) and the word "bottom" is wrapped to the beginning of the next line appears like this: "foggybottom" when it appears in the "sent" folder. The two words were separated by a single space when composing. Does not happen all the time, only occasionally. I cannot reproduce this problem on demand - it only happens at random.

Answer 1

Can you confirm that you are using Plain Text, not HTML?
do you use Plain Text all the time?
Can you check the following and say what you have as settings:
Tools > Options > Advanced > General tab
or
Menu icon > Options > Options > Advanced > General tab
click on 'Config Editor' button
it will tell you to be careful :)
In top search type: flowed
What Value do you have for the following:
I have not changed anything, so this is the default settings on my system.
* mailnews.display.disable_format_flowed_support; Value = false
* mailnews.send_plaintext_flowed; Value = true
In top search type: wrap
All Value settings show what I have
What Value do you have for the following?
* mail.compose.wrap_to_window_width; Value = true
* mail.wrap_long_lines; Value = true
* mailnews.wraplength; Value = 72
* plain_text.wrap_long_lines; Value = false
* view_source.wrap_long_lines; Value = false
In the Saved Draft or Sent folder.
select the email so you can read contents in message pane
click on 'Other Actions' and then 'View source'
where it says 'content type does it also say 'format-flowed'
eg:
Content-Type: text/plain; charset=windows-1252; format=flowed
Content-Transfer-Encoding: 7bit