···587587Approach #1 (add-on)
588588^^^^^^^^^^^^^^^^^^^^
589589590590-Install the Toggle Word Wrap add-on that is available from
591591-https://addons.mozilla.org/thunderbird/addon/toggle-word-wrap/
592592-It adds a menu entry "Enable Word Wrap" in the composer's "Options" menu
590590+Install the Toggle Line Wrap add-on that is available from
591591+https://addons.thunderbird.net/thunderbird/addon/toggle-line-wrap
592592+It adds a button "Line Wrap" to the composer's toolbar
593593that you can tick off. Now you can compose the message as you otherwise do
594594(cut + paste, 'git format-patch' | 'git imap-send', etc), but you have to
595595insert line breaks manually in any text that you type.
596596+597597+As a bonus feature, the add-on can detect patch text in the composer
598598+and warns when line wrapping has not yet been turned off.
599599+600600+The add-on requires a few tweaks of the advanced configuration
601601+(about:config). These are listed on the download page.
596602597603Approach #2 (configuration)
598604^^^^^^^^^^^^^^^^^^^^^^^^^^^