setup_adjustments(math_view);
gtk_math_view_action_set_selected(GtkMathView* math_view, guint idx){  g_return_if_fail(math_view != NULL);  g_return_if_fail(math_view->interface != NULL);  g_return_if_fail(math_view->action_node != NULL);  MathMLActionElement* action_element = TO_ACTION(findMathMLElement(math_view->action_node));  assert(action_element != NULL);  action_element->SetSelectedIndex(idx);  math_view->interface->MinMaxLayout();  math_view->interface->Layout();  paint_widget(math_view);}