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[Dmitry Shachnev <mitya57@xxxxxxxxx>]

I think I can reproduce your bug, but I do not have enough time to debug
it. Can you please file this bug upstream on bugreports.qt-project.org?

> The QFileDialog by default uses the native dialogs i.e. GTK2?

On GNOME systems it does. The Gtk+ 2 dialog and native Qt dialogs look
totally different, it is very easy to distinguish between them.

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https://bugs.launchpad.net/bugs/1324059

Title:
  file save dialog fails to confirm overwrite existing file

Status in “qtbase-opensource-src” package in Ubuntu:
  New

Bug description:
  I am developing an app using Qt5.2.1, PyQt5, Python3.4 testing on
  Ubuntu14.04LTS.  All packages are Ubuntu packages.

  When a file exists already, e.g. 'foo.txt'.  Start the app which
  creates files of suffix '.txt'.  User creates new document and chooses
  'Save'.  App displays a file dialog for choosing a filename for
  saving, passing the default filename of 'untitled.txt'.  Filename
  textbox is empty (incorrectly?).  User enters just 'foo' in the
  filename text box.  User chooses the 'Save' button.  Dialog
  incorrectly fails to show a message box to confirm user wants to
  overwrite existing file.  Dialog returns filename 'foo.txt' to the
  app.  App proceeds to overwrite an existing file, causing user loss of
  data.

  The QFileDialog by default uses the native dialogs i.e. GTK2?  If app
  instead tells it to use the Qt provided dialog (non-native), the
  behaviour is as expected (the textbox displays 'untitled.txt' and the
  dialog confirms overwrite.)  (The native and non-native dialogs have
  different look-and-feel.)

  This is changed behaviour from Ubuntu 13.04 and Qt4.8.  (But I am
  uncertain whether Qt used the native GTK dialog in those versions.)

  I have also tested on Ubuntu 14.04Gnome, and the behaviour seems
  slightly different: depending on whether the user Tabs out of the
  textbox, the dialog completes the filename in the textbox (i.e. finds
  the existing file and selects it) and DOES confirm overwrite.  (I will
  need to retest to be sure about this.)

  Note that I have experienced a related bug, where the dialog emits
  'fileSelected' signal twice, once with 'foo' and once with 'foo.txt.'
  Discussed at qt-project.org forums, but not reported here yet.

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