[Akonadi] [Bug 312847] New: Nepomuk Feeder does not recognise removal of the important flag

[Jan Gerrit Marker]

https://bugs.kde.org/show_bug.cgi?id=312847

            Bug ID: 312847
           Summary: Nepomuk Feeder does not recognise removal of the
                    important flag
    Classification: Unclassified
           Product: Akonadi
           Version: 4.10
          Hardware: Ubuntu Packages
                OS: Linux
            Status: CONFIRMED
          Severity: normal
          Priority: NOR
         Component: Nepomuk Feeder Agents
          Assignee: kdepim-bugs at kde.org
          Reporter: jangerrit at weiler-marker.com
                CC: vkrause at kde.org

Every time the "Important" flag of an email is removed nepomuk does not remove
the association between the email and the "Important" tag from its database.

Reproducible: Always

Steps to Reproduce:
1. Mark a message as important
2. Remove the important flag again
Actual Results:  
Open akonadiconsole, search for the email and have a look at the "Nepomuk" tab: 
"Important" is still checked although the \FLAGGED flag ("Internals" tab) is
not set anymore.

Expected Results:  
"Important" should not be a tag of the email anymore.

I had a look at the code:
For every update of an email the nepomuk feeder agent creates a new graph which
is merged into the old already saved graph of the same email. The newly created
graph correctly does not contain the association with the tag but the old graph
does, of course. Nepomuk2::storeRessources() is used to push and merge the new
graph into the old one but that function does not remove the tag association
because from its point of view the association should not be deleted because
only new information of the new graph should be added to the old graph.
At least that's what I understood.
I am not sure how to fix this therefore I wrote this bug report.

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