New: Add locking state class to disabled buttons (#202)

Author: kirsty-hames

templates/pageLevelProgressItem.jsx

@@ -43,6 +43,7 @@ export default function PageLevelProgressItem(props) {
         className={classes([
           'pagelevelprogress__item-btn drawer__item-btn',
           'js-indicator js-pagelevelprogress-item-click',
+          (_isLocked) && 'is-locked',
           (_isLocked || !_isVisible) && 'is-disabled'
         ])}
         ref={indicatorSeat}