Add new filter `nav_menu_submenu_css_class` to the `Walker_Nav_Menu::start_el()` method, allowing themers to modify the sub menu classes output by `wp_nav_menu()`. Props: csloisel, darthaud, raisonon. Fixes: #36163. git-svn-id: https://develop.svn.wordpress.org/trunk@40537 602fd350-edb4-49c9-b593-d223f7449a82
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