public static bool RectangleInsideGdkRegion (RectangleD r, Gdk.Region region) {
r.Inflate (1.0, 1.0);
Gdk.Rectangle gdkRect = GdkRectangle (r);
Gdk.OverlapType type = region.RectIn (gdkRect);
return (type == Gdk.OverlapType.In || type == Gdk.OverlapType.Part);
}