gtk/gtk_deprecated_since_3_8.go
func (v *Window) GetOpacity() float64 {
	c := C.gtk_window_get_opacity(v.native())
	return float64(c)
}
func (v *Window) GetOpacity() float64 {
	c := C.gtk_window_get_opacity(v.native())
	return float64(c)
}
// GetOpacity is a wrapper around gtk_window_get_opacity()
// Deprecated since 3.8, replaced by GetOpacity on Widget (gtk_widget_get_opacity)