D12968: Simplify code dealing with creating new sessions.

[Kurt Hindenburg]

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

REPOSITORY
  R319 Konsole

BRANCH
  removeCodeDuplication

REVISION DETAIL
  https://phabricator.kde.org/D12968

To: tcanabrava, #konsole, hindenburg
Cc: konsole-devel, herrold, ngraham, maximilianocuria, hindenburg
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