D19001: katetextbuffer: refactor TextBuffer::save() to better separate code paths

[Luca Beltrame]

lbeltrame added a reviewer: KTextEditor.

REPOSITORY
  R39 KTextEditor

REVISION DETAIL
  https://phabricator.kde.org/D19001

To: mgerstner, dhaumann, cullmann, #ktexteditor
Cc: kwrite-devel, kde-frameworks-devel, gennad, michaelh, ngraham, bruns, demsking, cullmann, sars, dhaumann
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