Mac-style QMenu icons never show Disabled mode

Native Mac style normally suppresses icons in QMenu actions, but it's documented that you can make them appear using QAction::setIconVisibleInMenu or app.setAttribute(Qt::AA_DontShowIconsInMenus, false).

The problem is that menu-action icons always appear in Normal mode, even if the QAction itself is disabled. The exception is when the entire menu is disabled (e.g., when a modal dialog is open).

Screenshot and code example attached.  (Example is a modified copy of Qt Creator's built-in menus example project.)