title: GTK window hints
body: <p>I'm trying to get a window to cover the whole screen. Its positioning and dimensions is fine but it gets covered by the Gnome panel. To complicate things I have two monitors and this app needs to support people with multiple screens.</p>
  
  <p><code>WINDOW_TYPE_HINT_SPLASHSCREEN</code> is a good start. It covers both screens but not the panel. It's still there, just behind the panel.</p>
  
  <p><code>WINDOW_TYPE_HINT_DOCK</code> looked ideal but I need this window to take focus to listen to a keyboard event. <code>_DOCK</code> seems like it purposely ignores keyboard events (which kind of makes sense). Can I force it to take keyboard focus?</p>
  
  <p>Is there some way I can force a hinted window to cover the panel?</p>