Index: src/wp-admin/edit-form-advanced.php
===================================================================
--- src/wp-admin/edit-form-advanced.php	(revision 42226)
+++ src/wp-admin/edit-form-advanced.php	(working copy)
@@ -497,7 +497,7 @@
 <hr class="wp-header-end">
 
 <?php if ( $notice ) : ?>
-<div id="notice" class="notice notice-warning"><p id="has-newer-autosave"><?php echo $notice ?></p></div>
+<div id="notice" class="notice notice-warning is-dissmissable"><p id="has-newer-autosave"><?php echo $notice ?></p></div>
 <?php endif; ?>
 <?php if ( $message ) : ?>
 <div id="message" class="updated notice notice-success is-dismissible"><p><?php echo $message; ?></p></div>