D21402: Avoid double overwrite check

[Aleix Pol Gonzalez]

apol added a comment.


  That should work on every platform. In fact, it would be a bug if any platform didn't do it.
  
  https://doc.qt.io/qt-5/qfiledialog.html#Option-enum
  See QFileDialog::DontConfirmOverwrite.

REPOSITORY
  R40 Kate

REVISION DETAIL
  https://phabricator.kde.org/D21402

To: meven, #kate, #frameworks, cullmann
Cc: apol, dhaumann, kwrite-devel, domson, michaelh, ngraham, demsking, cullmann, sars
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