D16687: SessionManager: Avoid to accumulate outdated entries in the session file

[loh tar]

loh.tar created this revision.
loh.tar added a reviewer: Kate.
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REVISION SUMMARY
  Because the various save routines writes always only actual data to the
  session file remain data from e.g. closed documents, views or splitter which
  is at least ugly and a waste of expensive disk space :-)

TEST PLAN
  Take a look in your session files, typical at ~/.local/share/kate/sessions/ you will notice a bunch of file hints you didn't have open/loaded

REPOSITORY
  R40 Kate

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

AFFECTED FILES
  kate/session/katesessionmanager.cpp

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