Comment 2 for bug 1279798

The problem was that simply calling Window.show() doesn't mean that the window is brought to the foreground. Actually, there is nothing that guarantees this, because the user's settings and choice of window manager may affect the behavior. However, research and experimentation show that calling these two Gtk.Window methods:

        set_urgency_hint(true);
        present();

actually doesn't bring the window to the foreground either, but does at least cause
the user to be notified that the window wants attention, much like the way
Windows may make a taskbar icon flash orange.