[kmail2] [Bug 501794] New: application/pkcs7-mime attachments are not detected

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https://bugs.kde.org/show_bug.cgi?id=501794

            Bug ID: 501794
           Summary: application/pkcs7-mime attachments are not detected
    Classification: Applications
           Product: kmail2
           Version: 6.3.2
          Platform: Debian unstable
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: UI
          Assignee: kdepim-bugs at kde.org
          Reporter: daniele-kde at gobbetti.name
  Target Milestone: ---

SUMMARY
I'm experiencing an issue with an email with an attachment with Content-Type:
application/pkcs7-mime;. Kmail is NOT showing any attachment to this message,
but is showing the textual content followed by "this message is encoded.
("Questo messaggio è cifrato." in my localization) and a link to decode it. 

This is the link as it appears in message view -> view source -> HTML source:
```
<a href="kmail:decryptMessage" style="display: inline-flex; align-items:
center;"> <img src="file:qrc:/icons/breeze/actions/16/document-decrypt.svg"
height="48" width="48"> Decifra il messaggio </a>
```

Once I click the link the signature is checked and its status is shown, but the
underlying file is not shown and even right-clicking in the message window and
choosing to save attachments does not work (popup is shown that there is no
attachment)

The full headers of the part are:
```
Content-Type: application/pkcs7-mime;
        name="somedocument.docx.p7m"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
        filename="somedocument.docx.p7m"
```
I saved the message to disk and extracted the attachment with munpack without
issues.

STEPS TO REPRODUCE
1. Open an email with an attachment with mime type "application/pkcs7-mime"
2. Click the link "kmail:decryptMessage"

OBSERVED RESULT
The signature of the attachment is checked. No attachment is shown or detected.

EXPECTED RESULT
The attachment can be opened / exported / saved to disk.

SOFTWARE/OS VERSIONS
```
$ kinfo
Operating System: Debian GNU/Linux 12
KDE Plasma Version: 6.3.2
KDE Frameworks Version: 6.11.0
Qt Version: 6.8.2
Kernel Version: 6.12.16-amd64 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 7840U w/ Radeon  780M Graphics
Memory: 30.7 GiB of RAM
Graphics Processor: AMD Radeon 780M
```

ADDITIONAL INFORMATION

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