Variable MENU_ITEM_SELECTOR`Const`

MENU_ITEM_SELECTOR: "[role=\"menuitem\"], [role=\"menuitemcheckbox\"], [role=\"menuitemradio\"]" = '[role="menuitem"], [role="menuitemcheckbox"], [role="menuitemradio"]'

Selector matching every kind of menu item the dropdown and menu enhancers understand: plain actions plus checkable menuitemcheckbox/menuitemradio.