[Users] Poorly-wrapped text when viewed in external editor

[Jim Pachowski]

> > some of them -- viewed in an external text editor
> > (Geany; gedit) -- are wrapped, poorly, with the wrapped
> > lines terminating with an equals sign. E.g.
>
> That is probably the "flowed" format the messages are using. This
> article explains how it works nicely:
> https://cpbotha.net/2016/09/27/thunderbird-support-of-rfc-3676-formatflowed-is-half-broken/

Actually it sounds the external editor is picking up quoted printable
encoding while the email display is taking that encoding into account.