[kmail2] [Bug 337179] New: Kmail loses attachment filename encoding

[Kryol]

https://bugs.kde.org/show_bug.cgi?id=337179

            Bug ID: 337179
           Summary: Kmail loses attachment filename encoding
    Classification: Unclassified
           Product: kmail2
           Version: 4.13.2
          Platform: Kubuntu Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: kryol at bigmir.net

During .docx document sending to Outlook client Kmail loses atachment filename
encoding.
This information was correct at the sent-mail folder but bad on receiver side,
e.g.
sent-mail:
--nextPart2170179.eotn1eU03S
Content-Transfer-Encoding: 7Bit
Content-Type: text/plain; charset="utf-8"


--nextPart2170179.eotn1eU03S
Content-Disposition: attachment;
filename="=?UTF-8?B?0KLQtdGB0YLQvtCy0YvQuSDQtNC+0LrRg9C80LXQvdGCLmRvY3g=?="
Content-Transfer-Encoding: base64
Content-Type:
application/vnd.openxmlformats-officedocument.wordprocessingml.document;
name="=?UTF-8?B?0KLQtdGB0YLQvtCy0YvQuSDQtNC+0LrRg9C80LXQvdGCLmRvY3g=?="

on receiver side:
--nextPart2170179.eotn1eU03S
Content-Transfer-Encoding: 7Bit
Content-Type: text/plain; charset="utf-8"


--nextPart2170179.eotn1eU03S
Content-Disposition: attachment;
filename*=''%D0%A2%D0%B5%D1%81%D1%82%D0%BE%D0%B2%D1%8B%D0%B9%20%D0%B4%D0%BE%D0%BA%D1%83%D0%BC%D0%B5%D0%BD%D1%82%2Edocx
Content-Transfer-Encoding: base64
Content-Type:
application/vnd.openxmlformats-officedocument.wordprocessingml.document;
name*=''%D0%A2%D0%B5%D1%81%D1%82%D0%BE%D0%B2%D1%8B%D0%B9%20%D0%B4%D0%BE%D0%BA%D1%83%D0%BC%D0%B5%D0%BD%D1%82%2Edocx

and outlook could not recognize attachment filename.

Reproducible: Always

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