title: How to make a QInputDialog trigger the virtual keyboard to show up?
body: <p>I am developing a Qt application with Python and PySide.
  The application runs on Ubuntu Linux; the machine has a touch screen. </p>
  
  <p>The virtual keyboard 'onboard' is used to let the user enter text. By default it is hidden. Once a text field in an application like <em>gedit</em> gets the focus it automatically triggers the virtual keyboard and it shows up.</p>
  
  <p>However, in my application I have a QInputDialog that ask the user for some input. In my case, focusing the text field of the QInputDialog does not trigger the virtual keyboard to show up. How can I achieve that?</p>