SUMMARY

The message to denote what kind of email message you have i.e. 'HTML message' or 'Plain text message' is strangely positioned between the mail folder list, and the email body itself.  Perhaps we can have an icon instead to denote this in the email header section ie where it shows to, from, and subject header.  There's plenty of room on the right hand side, or it can be placed elsewhere.

STEPS TO REPRODUCE
1. open up kmail and click on an email, and you'll see the html/plain text notification message between the email folders window and the email body.  

OBSERVED RESULT
As above.

EXPECTED RESULT
perhaps an icon at the top of the email message as explained above, or in a different more relevant location.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: opensuse TW (latest)
(available in About System)
KDE Plasma Version: 5.16.5
KDE Frameworks Version: 5.61.0
Qt Version: 5.13.1

ADDITIONAL INFORMATION