[kmail2] [Bug 397703] New: Kmail2 5.9.0: Message list shows read mails as unread

[Till Schäfer]

https://bugs.kde.org/show_bug.cgi?id=397703

            Bug ID: 397703
           Summary: Kmail2 5.9.0: Message list shows read mails as unread
           Product: kmail2
           Version: 5.9.0
          Platform: Gentoo Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: message list
          Assignee: kdepim-bugs at kde.org
          Reporter: till2.schaefer at uni-dortmund.de
  Target Milestone: ---

Created attachment 114529
  --> https://bugs.kde.org/attachment.cgi?id=114529&action=edit
screenshot of the bug (2 mails marked blue in the folder golem with unread
count 0)

When I go through my mails in the message list, some mails are still marked
unread after if have read them. However, the counter in the folder view is
decreasing correctly (see screenshot: two mails are painted blue in the folder
golem, but the folder count is 0). Changing the folder does not fix the
problem. Only a restart of KMail fixes the wrong representation. I allway
navigate with the keyboard to switch through the mails (arrow keys), but after
the bug occurred, clicking the schroedinger state mail does not fix the wrong
representation. 

This is a regression after upgrading to KMail 5.9.0 from 5.8.3 and happens
quiet frequently.

complete software stack: 
- kde apps 18.08.0
- kde frameworks: 5.49
- plasma 5.13.4
- qt 5.11.1

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