mail: encode long unicode lines in emails properly (
issue5687)
3e544c074459 introduced a bug: emails Content-Transfer-Encoding
is silently replaced with 'quoted-printable' while any other
encoding could be used by underlying code. The problem is revealed
when a long unicode line is encoded.
The patch implements proper check which works for any text and
encoding.
#require docutils gettext
$ $TESTDIR/check-gendoc zh_TW
checking for parse errors