Sergey Biryukov 3487611129 Menus: Avoid a PHP warning in add_submenu_page() when the same value is passed for both $parent_slug and $menu_slug parameters.
Props welcher, ispreview, ayeshrajans, NextScripts, adamsilverstein, garrett-eclipse, 123host.
Merges [46868] to the 5.3 branch.
Fixes #48599.
Built from https://develop.svn.wordpress.org/branches/5.3@46869


git-svn-id: http://core.svn.wordpress.org/branches/5.3@46669 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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