Ticket #29303: 29303.2.diff

src/wp-includes/js/media-views.js

@@ -6576 +6576 @@
                  */
                 toggleSelectionHandler: function( event ) {
                         if ( 'keydown' === event.type && 9 === event.keyCode && event.shiftKey && event.target === this.$( ':tabbable' ).get( 0 ) ) {
-                                this.$( ':tabbable' ).eq( 0 ).blur();
+                                this.controller.$el.find( 'li.selected' )[0].focus();
                                 return false;
                         }