Ticket #23560: 23560.22.diff

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

@@ -561 +561 @@
                         // The right arrow key
                         if ( 39 === event.keyCode ) {
                                 this.nextMediaItem();
+                                this.$('.right').focus();
                         }
                         // The left arrow key
                         if ( 37 === event.keyCode ) {
                                 this.previousMediaItem();
+                                this.$('.left').focus();
                         }
                 },