SUMMARY In the message window, the enabled/disabled status of the Message / Mark Message / Mark Message as (Un)read menu items doesn't change when the status of the message changes. STEPS TO REPRODUCE 1. Open (say) an already read message. 2. In the message window, click Message / Mark Message / Mark Message as Unread. The message gets marked as unread. OBSERVED RESULT The Mark Message as Unread menu item continues to be enabled, Mark Message as Read continues to be disabled. Vice versa if you start with an unread message and mark it as read. EXPECTED RESULT Whenever a message is marked unread, Mark Message as Unread is disabled and Mark Message as Read is enabled. Vice versa whenever a message is marked read. ADDITIONAL INFORMATION Happens regardless of why a message's read/unread status changes while the message window is open: whether I change it from the message window, or from the message list, or it becomes marked read a few seconds after I open the message window. (I've configured KMail to mark messages read if they are open for 2 seconds.) May be related to Bug 424184 (which seems to be fixed, but it's not marked as such). SOFTWARE/OS VERSIONS openSUSE Tumbleweed 20210222 KMail 5.16.2 KDE Applications 20.12.2 KDE Plasma Version: 5.21.0 KDE Frameworks Version: 5.78.0 Qt Version: 5.15.2