[kmail2] [Bug 447297] New: UTF-8 characters decoded incorrectly on reply

[kzi]

https://bugs.kde.org/show_bug.cgi?id=447297

            Bug ID: 447297
           Summary: UTF-8 characters decoded incorrectly on reply
           Product: kmail2
           Version: unspecified
          Platform: openSUSE RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: composer
          Assignee: kdepim-bugs at kde.org
          Reporter: kde at snafu.de
  Target Milestone: ---

SUMMARY
If Configure > Composer > Charset > Keep original charset ... is checked,
quoted UTF-8 encoded messages are incorrectly decoded as Latin-1 or similar on
reply, leading to character sequences such as ü for ü or é for é and so on.

If the checkbox is unchecked, non-ASCII UTF-8 characters are decoded correctly.

See ADDITIONAL INFORMATION below for some settings of mine that might be
related. Happy to provide additional information.


STEPS TO REPRODUCE
1. Choose an eMail with Content-Type: text/html; charset=UTF-8 (or"utf-8"),
Content-Transfer-Encoding: base64 (not sure transfer encoding matters)
2. Check "Keep original charset ..." (see above)
3. Reply to chosen eMail
4. Uncheck "Keep original charset ..." (see above)
5. Reply to chosen eMail

OBSERVED RESULT
UTF-8 characters decoded as e.g. ü instead of ü when "Keep original charset
..." is checked.
UTF-8 characters correctly decoded when "Keep original charset ..." is
unchecked.

EXPECTED RESULT
UTF-8 characters correctly decoded even when "Keep original charset ..." is
checked.


SOFTWARE/OS VERSIONS
Linux/KDE Plasma: openSUSE Tumbleweed 20211212
KDE Plasma Version: 5.23.4
KDE Frameworks Version: 5.88.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION
Some other settings of mine:
Configure > Appearance > General > Override character encoding: Auto
Configure > Composer > General > Reply or forward ... (plain text or HTML):
unchecked
Configure > Composer > General > Reply or forward ... (plain text or HTML):
unchecked
Configure > Composer > Charset: {utf-8, iso-8859-1, us-ascii, utf-8 (locale)}
in this order

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