[kmail2] [Bug 356517] New: Message window displays no content for multipart HTML emails with empty text/plain section when HTML is not preferred over "text-only"

[Oliver Kurz via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=356517

            Bug ID: 356517
           Summary: Message window displays no content for multipart HTML
                    emails with empty text/plain section when HTML is not
                    preferred over "text-only"
           Product: kmail2
           Version: unspecified
          Platform: Other
               URL: https://paste.kde.org/pfrbri6qy
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: message list
          Assignee: kdepim-bugs at kde.org
          Reporter: okurz at suse.de

== observation ==
multipart emails with HTML content and no text content do not display anything
in the message window

Reproducible: Always

Steps to Reproduce:
1. receive/load multipart email
2. observe blank message window
3. selecting "Prefer HTML over text" in kmail->security settings causes the
HTML version of the email to properly display

Actual Results:  
blank message window displayed

Expected Results:  
different options:
 1. html version displayed instead
 2. notification about empty text/plain section is displayed
 3. text is automagically rendered from HTML content
 4. raw HTML content is dumped instead

also see
https://litmus.com/blog/best-practices-for-plain-text-emails-a-look-at-why-theyre-important

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