gtk/gtk_since_3_12.go
func (v *HeaderBar) SetDecorationLayout(layout string) {
	cstr := C.CString(layout)
	defer C.free(unsafe.Pointer(cstr))
	C.gtk_header_bar_set_decoration_layout(v.native(), (*C.gchar)(cstr))
}
func (v *HeaderBar) SetDecorationLayout(layout string) {
	cstr := C.CString(layout)
	defer C.free(unsafe.Pointer(cstr))
	C.gtk_header_bar_set_decoration_layout(v.native(), (*C.gchar)(cstr))
}
// SetDecorationLayout is a wrapper around gtk_header_bar_set_decoration_layout().