[Bug 308952] New: Messages disappear after folder rename

[Kjetil Kilhavn]

https://bugs.kde.org/show_bug.cgi?id=308952

            Bug ID: 308952
          Severity: critical
           Version: 4.8.5
          Priority: NOR
          Assignee: kdepim-bugs at kde.org
           Summary: Messages disappear after folder rename
    Classification: Unclassified
                OS: Linux
          Reporter: kjetil at kilhavn.no
          Hardware: openSUSE RPMs
            Status: UNCONFIRMED
         Component: folders
           Product: kmail2

This bug seems related to 308378 - https://bugs.kde.org/show_bug.cgi?id=308378
- but I do not get any messages about the folder not existing. Therefore I
decided to post it as a new report.
I was also unsure whether it should be reported as a Akonadi or KMail2 problem,
feel free to reassign :-)

In a (local) folder I had three messages.
I renamed the folder (from Vivaldi to Plasma Active, not that it should matter)
and moved three more messages to the folder.
In the message list, all messages were displayed, but only the new messages
would be displayed when selected.

I suspected the problem was related to the renaming of the folder.
Now, in slight desperation, I tried several tricks, so my memory is perhaps not
complete. As a software developer I should be sensible enough to write down the
steps once I suspected it was a bug - but unfortunately I was not.

Now, as I am writing this, I have two folders. One named Plasma Active and one
named Vivaldi. I believe the Vivaldi is the original folder re-named again in
the hope that the messages would magically reappear, and the Plasma Active is a
new folder I created (sibling of Vivaldi). However, memory may serve me wrong,
and I may also have renamed the folder more than twice.

Anyway, the end result was that none of the folders displayed any messages!
However, in disk folder
"~/.local/share/.local-mail.directory/.KDE.directory/Vivaldi/new" the original
three messages are present - so the mail has not been lost.

The three new messages I had moved to the folder after renaming it mysteriously
disappeared, but were found again in the inbox and sent mail folders - who said
computers are not intelligent!

I tried to move one of those messages to the Plasma Active folder. The message
now appears in both the Plasma Active folder and the Vivaldi folder in KMail,
but on disk it is found in the
"~/.local/share/.local-mail.directory/.KDE.directory/Plasma Active/new" folder.

I closed KMail (Kontact) and re-opened it. That did not solve or create any
problems, i.e. the Plasma Active and Vivaldi folders still show the message I
moved to the Plasma Active folder - and the folders on disk still have the
correct messages as described above.

Reproducible: Always

Steps to Reproduce:
1. Create a local folder and move a message into it.
2. Rename the folder and move another message into it.
3. Click on the message you first moved into the folder to display it.
Actual Results:  
Message is not displayed in message view area.

Expected Results:  
Message is displayed in message view area.

Although the data are not actually lost they appear to be lost, and only people
who know where to look will find the messages. If KMail had been able to
restore correct display after a restart the problem would not be as severe as
it now (in my opinion) is.

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