Avoid a sanitize_key() call on ID, as this causes it to be lowercased. wp_dropdown_users() requires user_login as a fallback; specify it for get_users(). see #21767.



git-svn-id: http://core.svn.wordpress.org/trunk@24719 1a063a9b-81f0-0310-95a4-ce76da25c4cd