Created attachment 311 [details]
Reproducing the bug

The function QtGui.QFileDialog.getSaveFileName(...) is supposed to return both
the filename chosen to save and the selected filter (as a tuple).
Unfortunately, if you try to run the attached example, you'll get the file name
but not the selected filter. The function actually returns all the filters, as
passed as the 4th argument ("Text files (*.txt);;Image files (*.png)")

I wrote a patch to fix this bug:
Edit the file PySide/QtGui/typesystem_gui_common.xml and find the line
containing
<modify-function signature="getSaveFileName ... >
It's inside the <object-type name="QFileDialog"> tag

Replace the following lines
<inject-code class="target" position="end">
  <insert-template name="return_for_QFileDialog"/>
</inject-code>

with the lines below

<inject-code class="target" position="beginning">
  QString _selectedFilter_;

  QString _fileName_ = %CPPSELF.%FUNCTION_NAME(%1, %2, %3, %4,
&amp;_selectedFilter_, %6);
  %PYARG_0 = Shiboken::makeTuple(_fileName_, _selectedFilter_);
</inject-code>

and the following lines
<modify-argument index="5">
  <remove-argument/>
</modify-argument>

with the lines below
<modify-argument index="5">
  <replace-type modified-type="QString"/>
</modify-argument>