[kmail2] [Bug 507050] New: Mail Filter Message Tag Rules imported from Thunderbird results in message tag rules that get destroyed upon viewing them.

[Gary Kenneth Krueger]

https://bugs.kde.org/show_bug.cgi?id=507050

            Bug ID: 507050
           Summary: Mail Filter Message Tag Rules imported from
                    Thunderbird results in message tag rules that get
                    destroyed upon viewing them.
    Classification: Applications
           Product: kmail2
      Version First 5.24.5
       Reported In:
          Platform: Kubuntu
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: garykennethkrueger at gmail.com
  Target Milestone: ---

SUMMARY
Mail filter rules (containing Message tags) disappear when viewing filters
imported from Thunderbird.  May be related to the fact that message tags in the
rules get shifted to a different tag on import.  I had a special message tag,
called "Downloaded" in the Thunderbird filter rules.  So, it may be necessary
to include that one.

STEPS TO REPRODUCE
1. Do a fresh install of KDE.
2. In the process, import mail filters from Thunderbird that contain message
tag rules.  I started with a rule for age greater than 14 days before the
message tag rule(s) in each relevant filter.  I had set it for deleting
messages.  You might want to choose something less destructive.  I was also
using a user defined message tag "Downloaded" in the Thunderbird filters.
3. You may disable any or all of the filters from running in this process. 
Whether they are turned on is not relevant to the issue.
4. Add one or more simple filters (such as age greater than 14 days) at the top
of the list of filters.
5. Add 3 more filters with (age greater than 14 days is what I used) above all
of the other filters.
6. Step through repeatedly looking at only the first 3 filters.  Nothing
unexpected happens.
7. Step down to the imported filters with message tag rules.  It likely looks
fine.
8. Move up and down to other imported filters above and below the filter in
question, and back again.  You will find that the message tag rules begin to
transform & disappear.
9. Move up to the 3 filters at the top that were created in KDE.  Step up and
down between them.  You will now find that their filters begin to decay and
disappear.

OBSERVED RESULT

Every time you move out and back into any of the affected rules, message tag
rules transform and disappear.
Typically it transforms from something like "Downloaded" to "akonadi:?tag=2"
(or something like that).

EXPECTED RESULT
Message tag rules that contain "Downloaded", "Important", "To Do", or whatever
should not change to anything else when stepping through the list of filters,
and shouldn't disappear.

SOFTWARE/OS VERSIONS
Kubuntu:  24.04 LTS
Kernel:  6.8.0.63-generic (64-bit)
Linux/KDE Plasma:
KDE Plasma Version:  5.27.12
KDE Frameworks Version: 5.115.0
Qt Version: 5.15.13
Graphics Plaftorm:  X11

ADDITIONAL INFORMATION
Quitting KDE & Stopping Akonadi before going back into KDE doesn't make it any
better.  Things are just as bad when you get back to looking at the filters. 
And moving between them continues to destroy message tag rules.

Also, "akonadictl fsck" doesn't seem to resolve the issue.

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