[kdepim] [Bug 419949] New: KMail only partly shows HTML mail

[xchain]

https://bugs.kde.org/show_bug.cgi?id=419949

            Bug ID: 419949
           Summary: KMail only partly shows HTML mail
           Product: kdepim
           Version: GIT (master)
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: messageviewer
          Assignee: kdepim-bugs at kde.org
          Reporter: xchain at gmx.net
  Target Milestone: ---

Created attachment 127445
  --> https://bugs.kde.org/attachment.cgi?id=127445&action=edit
Test Case

See attached test case: With HTML mode enabled, only the quote is visible, but
not the actual reply.

While probably the sending MUA (GMX Mail for Android) is to blame for most of
this, it would be great if KMail was able to deal with such mails (again).

I can reproduce this bug with KMail 5.9.2 (Qt 5.11.2 / KF 5.51) as well as
KMail 5.14.40 (Qt 5.14.1 / KF 5.69).

Cross-Testing:
- Thunderbird is able to show everything just fine.
- Thunderbird correctly displays all line breaks, while KMail seems to strip
every line break even in the quoted section.

It is interesting how rendering is getting worse over time:
- KMail 1.9.10 (Qt 3 w/ KHTML?) works excellent (with correct line breaks
even).
- KMail 4.14.2 (Qt 4) renders the mail just fine (although without line breaks
in the quoted part).
- KMail 5.9.2 (Qt 5 w/ QtWebKit?) displays some parts of the reply before
KMail's mail header.
- KMail 5.14.40 (Qt 5 w/ QtWebEngine?) completely hides the reply.

Possibly related: Bug 345360

Bug 418482 also seem related, however the fix does not work in this case.

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