D16687: SessionManager: Avoid to accumulate outdated entries in the session file

[Christoph Cullmann]

cullmann accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R40 Kate

REVISION DETAIL
  https://phabricator.kde.org/D16687

To: loh.tar, #kate, cullmann
Cc: cullmann, kwrite-devel, #kate, michaelh, ngraham, demsking, sars, dhaumann
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