Ticket #7392: 7392.8.diff

wp-admin/includes/post.php

@@ -1320 +1320 @@
                 $new_autosave['ID'] = $old_autosave->ID;
                 $new_autosave['post_author'] = $post_author;
 
+                // If the new autosave is the same content as the post, delete the old autosave.
+                $post = get_post( $post_id );
+                $autosave_is_different = false;
+                foreach ( array_keys( _wp_post_revision_fields() ) as $field ) {
+                        if ( normalize_whitespace( $new_autosave[ $field ] ) != normalize_whitespace( $post->$field ) ) {
+                                $autosave_is_different = true;
+                                break;
+                        }
+                }
+
+                if ( ! $autosave_is_different ) {
+                        wp_delete_post_revision( $old_autosave->ID );
+                        return;
+                }
+
                 return wp_update_post( $new_autosave );
         }
 
         // _wp_put_post_revision() expects unescaped.
-        $_POST = wp_unslash($_POST);
+        $post_data = wp_unslash( $_POST );
 
         // Otherwise create the new autosave as a special post revision
-        return _wp_put_post_revision( $_POST, true );
+        return _wp_put_post_revision( $post_data, true );
 }
 
 /**