Documentation/email-clients.txt: update Thunderbird docs with wordwrap plugin

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Thunderbird (GUI)

By default, thunderbird likes to mangle text, but there are ways to

coerce it into being nice.

- Under account settings, composition and addressing, uncheck "Compose

  messages in HTML format".

- Edit your Thunderbird config settings to tell it not to wrap lines:

      user_pref("mailnews.wraplength", 0);

- Edit your Thunderbird config settings so that it won't use format=flowed:

      user_pref("mailnews.send_plaintext_flowed", false);

- You need to get Thunderbird into preformat mode:

. If you compose HTML messages by default, it's not too hard. Just select

  "Preformat" from the drop-down box just under the subject line.

. If you compose in text by default, you have to tell it to compose a new

  message in HTML (just as a one-off), and then force it from there back to

  text, else it will wrap lines. To do this, use shift-click on the Write

  icon to compose to get HTML compose mode, then select "Preformat" from

  the drop-down box just under the subject line.

Thunderbird is an Outlook clone that likes to mangle text, but there are ways

to coerce it into behaving.

- Allows use of an external editor:

  The easiest thing to do with Thunderbird and patches is to use an

  View->Toolbars->Customize... and finally just click on it when in the

  Compose dialog.

To beat some sense out of the internal editor, do this:

- Under account settings, composition and addressing, uncheck "Compose

  messages in HTML format".

- Edit your Thunderbird config settings so that it won't use format=flowed.

  Go to "edit->preferences->advanced->config editor" to bring up the

  thunderbird's registry editor, and set "mailnews.send_plaintext_flowed" to

  "false".

- Enable "preformat" mode: Shft-click on the Write icon to bring up the HTML

  composer, select "Preformat" from the drop-down box just under the subject

  line, then close the message without saving.  (This setting also applies to

  the text composer, but the only control for it is in the HTML composer.)

- Install the "toggle wordwrap" extension.  Download the file from:

    https://addons.mozilla.org/thunderbird/addon/2351/

  Then go to "tools->add ons", select "install" at the bottom of the screen,

  and browse to where you saved the .xul file.  This adds an "Enable

  Wordwrap" entry under the Options menu of the message composer.

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TkRat (GUI)