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.
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----