D13898: Use non deprecated fastInsert in file.cpp (first of many to come)

[David Faure]

dfaure accepted this revision.
dfaure added a comment.
This revision is now accepted and ready to land.


  Thanks!

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REVISION DETAIL
  https://phabricator.kde.org/D13898

To: jtamate, dfaure, #frameworks
Cc: bruns, kde-frameworks-devel, michaelh, ngraham