[kmime] [Bug 387423] New: multipart/alternative Attachments

[David E. Narvaez]

https://bugs.kde.org/show_bug.cgi?id=387423

            Bug ID: 387423
           Summary: multipart/alternative Attachments
           Product: kmime
           Version: git
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: david.narvaez at computer.org
  Target Milestone: ---

Created attachment 109105
  --> https://bugs.kde.org/attachment.cgi?id=109105&action=edit
Suggested path

Ultimately my goal is for KMail to display the attachment icon next to emails
that have attachments. I have narrowed down the issue of emails with
attachments for which KMail does not display that icon to multipart/alternative
emails in which the attachment is in the HTML part. Before revision 83859810 of
KMime, the code had a flag to detect attachments even inside alternative parts,
but that does not seem to be the case and it explicitly ignores alternative
parts now, which is wrong for some (many?) use cases, including Akonadi
flagging an item as HasAttachment (which is what ultimately is used to show the
KMail icon) because the email in fact has an attachment in one of its forms.

I could patch the code but I am not sure about the implications elsewhere or
what the desired behavior is (assuming the current behavior is not the desired
one). For instance, the attached patch descends into the parts of a
multipart/alternative email to check for attachments, but attachment-looking
parts that are immediately under the multipart/alternative container are not
considered attachments. This does not break the tests according to ctest (but
the patch does not add a specific test like having a multipart/alternative
composed of a text/plain and an image/jpeg).

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