Ticket #41803: 41803.diff

src/wp-admin/js/theme.js

@@ -105 +105 @@
                 view.render();
                 this.searchContainer
                         .append( $.parseHTML( '<label class="screen-reader-text" for="wp-filter-search-input">' + l10n.search + '</label>' ) )
-                        .append( view.el );
+                        .append( view.el )
+                        .on( 'submit', function( event ) {
+                                event.preventDefault();
+                        });
         },
 
         // Checks when the user gets close to the bottom