[kmail2] [Bug 483686] New: Since Plasma 6, cannot reply to messages in any mailbox for a large account

[luna sophia]

https://bugs.kde.org/show_bug.cgi?id=483686

            Bug ID: 483686
           Summary: Since Plasma 6, cannot reply to messages in any
                    mailbox for a large account
    Classification: Applications
           Product: kmail2
           Version: 6.0.0
          Platform: Arch Linux
                OS: Linux
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: message list
          Assignee: kdepim-bugs at kde.org
          Reporter: luna at unixpoet.dev
  Target Milestone: ---

SUMMARY

I have a mailbox with ~90k messages that, while rather slow, still worked under
Plasma 5. Since upgrading to Plasma 6, when I try to reply to a message for
that account (in *any* mailbox, not just the large one), kmail uses 100% CPU
and seems to consume all memory on the system--when I last observed this, I let
it go to 25 GB RES before closing it. I did not have this problem with Plasma
5.

STEPS TO REPRODUCE
1. Have or create a large mailbox, maybe 50k messages will suffice
2. Try to reply to a message in the account, in any mailbox, using either menu
button or keybinding
3. Observe the application become unresponsive, using 100% CPU and eventually
100% memory

OBSERVED RESULT
Kmail uses all CPU and memory

EXPECTED RESULT
The compose window opens for the message reply

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux updated as of this morning
(available in About System)
KDE Plasma Version: 6.0.2
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2

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