Rich Text Edit example: can't save to a file

Using the widgets rich text editor example, it is not possible to save the content to a file.

To reproduce:

• Launch the example
• Modify some text
• press the Save button
  =>Using the save button creates the message:

  QTextDocumentWriter::write: the device can not be opened for writing 

• then using the Save As button generates:

  (textedit:25438): Gtk-WARNING **: Unable to retrieve the file info for `file:///home/caroline/Qt5.1.1_offE140/5.1.1/gcc_64/examples/widgets/richtext/build-textedit-Desktop_Qt_5_1_1_GCC_64bit-Debug/mytextfile': Error stating file '/home/caroline/Qt5.1.1_offE140/5.1.1/gcc_64/examples/widgets/richtext/build-textedit-Desktop_Qt_5_1_1_GCC_64bit-Debug/mytextfile': No such file or directory