[kmail2] [Bug 445264] New: Decode decrypted message with wrong character encoding method

[Yao Nianqing]

https://bugs.kde.org/show_bug.cgi?id=445264

            Bug ID: 445264
           Summary: Decode decrypted message with wrong character encoding
                    method
           Product: kmail2
           Version: unspecified
          Platform: openSUSE RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: crypto
          Assignee: kdepim-bugs at kde.org
          Reporter: imbearchild at gmail.com
  Target Milestone: ---

When KMail received an encrypted mail, it will use GnuPG to decrypt it,and
GnuPG will send decrypted data back in UTF-8 (As long as that is text message),
so KMail should display those data in UTF-8, too. But sometimes, while there's
a header line that indicates charset, for example, `Content-Type: text/plain;
charset="gb2312"`, KMail will display the decrypted data in that charset, not
UTF-8. So that message will be unreadable.

STEPS TO REPRODUCE
1. Received an encrypted mail which indicates its non-UTF-8 charset. 
   You can send a email with inline GPG meaasge from a Chinese Win10 machine
with built-in mail client of Win10 to make this. Or you can send a mail to
yourself and move it to local maildir, then modify its header.
2. Decrypt it in KMail.

OBSERVED RESULT
Unreadable characters will display as decrypted message.

EXPECTED RESULT
Decode it properly.

SOFTWARE/OS VERSIONS
Operating System: openSUSE Tumbleweed 20211105
KDE Plasma Version: 5.23.2
KDE Frameworks Version: 5.87.0
Qt Version: 5.15.2
GnuPG: 2.2.27
libgcrypt: 1.9.4

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