title: Background color of a Gtk.TextView - can't see selection
body: <p>I successfully changed the background color of a Gtk.TextView (GTK3) with method override_background_color:</p>
  
  <pre><code>color.parse(self.settings.get_string("bgcolor"))
  self.ui.NoteView.override_background_color(Gtk.StateType.NORMAL,color)
  </code></pre>
  
  <p>I also override the foreground color.
  Unfortunatelly in that case making a selection in the text is invisible.
  How can I modify the background and foreground color of a TextView without loosing the visible text selecting?</p>