functions.js aria-expanded=true

When visiting a page that is featured in a sub-menu, the sub-menu is expanded but the ARIA attribute still says aria-expanded=”false” (even in version 1.7). It seems the functions.js file is missing the last part of this on line 19:

container.find( ‘.current-menu-ancestor > button’ ).addClass( ‘toggle-on’ ).attr( ‘aria-expanded’ , true );