Peter Wilson 1345e33a21 Menus: Add filter to sub-menu class in nav menus.
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
2017-04-23 07:15:47 +00:00
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