Ticket #21283: 21283.12.diff

wp-admin/js/customize-controls.js

@@ -104 +104 @@
                                 if (!toggleFreeze)
                                         control.container.toggleClass('open');
 
+                                if ( control.container.hasClass('open') )
+                                        control.container.parent().parent().find('li.library-selected').focus();
+
                                 // Don't want to fire focus and click at same time
                                 toggleFreeze = true;
                                 setTimeout(function () {