[kmail2] [Bug 365612] New: Missing header in message preview pane and full message window

[Styopa Semenukha via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=365612

            Bug ID: 365612
           Summary: Missing header in message preview pane and full
                    message window
           Product: kmail2
           Version: unspecified
          Platform: Debian unstable
               URL: http://imgur.com/PXlrZnS
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: UI
          Assignee: kdepim-bugs at kde.org
          Reporter: semenukha+kdebugs at gmail.com

KMail version: 5.2.2
Using:
KDE Frameworks 5.23.0
Qt 5.6.1 (built against 5.6.1)
The xcb windowing system

KMail doesn't display the blue header (To, From, Subject, Spam Score, User
Agent) in the message preview pane or separate message window.

This affects HTML and plaintext mail alike. The menu View > Headers is also
empty. When launching kmail from command line, the following string printed to
stderr:
log_messageviewer: trying to writeMsgHeader() without a header style set!

If I remove ~/.config/kmail2rc, the bug still persists.

Reproducible: Always

Steps to Reproduce:
1. Select any message in folder view.
OR:
1. Open any message using double click.

Actual Results:  
Only message body (text or HTML) appears in preview pane and message window.

Expected Results:  
A header with From, To, Subject and optionally other fields (user agent, spam
score) in message preview pane and message window.

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