Ticket #31610: 31610.diff

src/wp-includes/js/wp-auth-check.js

@@ -49 +49 @@
                         $('#wp-auth-check-form').append( frame );
                 }
 
+                $( 'body' ).addClass( 'modal-open' );
                 wrap.removeClass('hidden');
 
                 if ( frame ) {
@@ -80 +81 @@
                 wrap.fadeOut( 200, function() {
                         wrap.addClass('hidden').css('display', '');
                         $('#wp-auth-check-frame').remove();
+                        $( 'body' ).removeClass( 'modal-open' );
                 });
         }