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vapi: make Gtk.Application.active_window nullable for gtk+-3 and gtk4

liferooter requested to merge liferooter/vala:nullable-gtk-application-active-window into master

Gtk.Application.active_window is non-nullable in VAPI, but is nullable indeed:

/**
 * gtk_application_get_active_window: (attributes org.gtk.Method.get_property=active-window)
 * @application: a `GtkApplication`
 *
 * Gets the “active” window for the application.
 *
 * The active window is the one that was most recently focused (within
 * the application).  This window may not have the focus at the moment
 * if another application has it — this is just the most
 * recently-focused window within this application.
 *
 * Returns: (transfer none) (nullable): the active window
 **/
GtkWindow *
gtk_application_get_active_window (GtkApplication *application)
{
  GtkApplicationPrivate *priv = gtk_application_get_instance_private (application);

  g_return_val_if_fail (GTK_IS_APPLICATION (application), NULL);

  return priv->windows ? priv->windows->data : NULL;
}

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