[Bug 281227] KMail2 4.7's "Find messages ..." reproducibly fails to search: "Unknown error. (Unable to create persistent search)"

[Ralph Moenchmeyer]

https://bugs.kde.org/show_bug.cgi?id=281227

--- Comment #28 from Ralph Moenchmeyer <rm at anracon.de> ---
(In reply to comment #25)
> (In reply to comment #24)
> It sounds like while some other pretty serious bugs are still there, this
> PARTICULAR bug ("Unknown error" dialog box) is fixed in 4.8 for you, after
> you have deleted and re-added your resources. Can you confirm this?

I deleted all nepomuk related config files and directories in ~-kde4. I deleted
my IMAP resource, added it again and let Nepomuk / virtuoso-t do their job from
scratch now while I fetched folder after folder manually from the server. There
are some inconsistencies 

I always let nepomuk/virtuso-t finish their jobs first before opening new
folders. With one exception for a last folder with several subfolders and a lot
of mails. I opened these folders, Nepomuk and virtuso-t started as expected.
They should have worked quite a while - at least 15 minutes. For testing
purposes I logged out and restarted the PC and afterwards Kmail. My
expectatioin was that the email indexing would continue. This was not the case.
There seems to be an additional bug. 

Regarding the other indexed folders and searching via the new dialog: The
results are pretty much the same. You can use the search dialog and select
folders. There is no "Unknown error" message.  

However, the search result list gives no reliable results. Recursive searching
over several levels of subfolders is sometimes not working at all. very often
the result list of a simple search gives you hits twice. Searches with combined
conditions most often do not work at all. Sometimes they work for AND
conditions, but if and only if the conditions are related to different parts of
the Email. But even then the result list is not reliable. 

Summary: The logic behind the search process still seems to be buggy regarding
recursive subfolder analysis and the handling of combinations of search
conditions.

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