[kmail2] [Bug 444783] New: Keep getting "Retrieving folder contents" when doing a large operation on another folder

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https://bugs.kde.org/show_bug.cgi?id=444783

            Bug ID: 444783
           Summary: Keep getting "Retrieving folder contents" when doing a
                    large operation on another folder
           Product: kmail2
           Version: 5.16.2
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: commands and actions
          Assignee: kdepim-bugs at kde.org
          Reporter: friededn at gmail.com
  Target Milestone: ---

SUMMARY
When I do a large operation on a folder (delete messages, mark as read, etc on
hundreds to thousands of emails) I cannot look at or do anything else with mail
until it completes, not even in a different folder or different email account.
I get the "Retrieving folder contents" message and have to wait (many minutes).
It is acting as if Kmail or Akonadi is only single threaded.

STEPS TO REPRODUCE
1. Delete a large number of emails (many hundreds to thousands)
2. Click on any other email message.

OBSERVED RESULT
I get the "Retrieving folder contents" message

EXPECTED RESULT
I would expect to be able to view other email messages while the operation
completes in the background.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 34
(available in About System)
KDE Plasma Version: 5.22.5
KDE Frameworks Version: 5.85.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION

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