Ticket #8199: no-update-nag-on-update-page.diff

wp-admin/includes/update.php

@@ -112 +112 @@
 add_filter( 'update_footer', 'core_update_footer' );
 
 function update_nag() {
+        if ( false !== strpos( $_SERVER['REQUEST_URI'], 'update-core.php' ) )
+                return;
+                
         $cur = get_preferred_from_update_core();
 
         if ( ! isset( $cur->response ) || $cur->response != 'upgrade' )