Ticket #7392: 7392-3.diff

wp-includes/default-filters.php

@@ -249 +249 @@
 add_action( 'plugins_loaded',             'wp_maybe_load_widgets',                    0    );
 add_action( 'plugins_loaded',             'wp_maybe_load_embeds',                     0    );
 add_action( 'shutdown',                   'wp_ob_end_flush_all',                      1    );
-add_action( 'pre_post_update',            'wp_save_post_revision'                          );
+add_action( 'pre_post_update',            'wp_save_post_revision',                   10, 2 );
 add_action( 'publish_post',               '_publish_post_hook',                       5, 1 );
 add_action( 'transition_post_status',     '_transition_post_status',                  5, 3 );
 add_action( 'transition_post_status',     '_update_term_count_on_transition_post_status', 10, 3 );

wp-includes/post.php

@@ -2866 +2866 @@
         $where = array( 'ID' => $post_ID );
 
         if ( $update ) {
-                do_action( 'pre_post_update', $post_ID );
+                do_action( 'pre_post_update', $post_ID, $data );
                 if ( false === $wpdb->update( $wpdb->posts, $data, $where ) ) {
                         if ( $wp_error )
                                 return new WP_Error('db_update_error', __('Could not update post in the database'), $wpdb->last_error);
@@ -4937 +4937 @@
  * @param int $post_id The ID of the post to save as a revision.
  * @return mixed Null or 0 if error, new revision ID, if success.
  */
-function wp_save_post_revision( $post_id ) {
+function wp_save_post_revision( $post_id, $new_data = null ) {
         // We do autosaves manually with wp_create_post_autosave()
         if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE )
                 return;
@@ -4955 +4955 @@
         if ( !post_type_supports($post['post_type'], 'revisions') )
                 return;
 
+        // if new data is supplied, check that it is different from last saved revision
+        if( is_array( $new_data ) ) {
+                $post_has_changed = false;
+                foreach( array_keys( _wp_post_revision_fields() ) as $field ) {
+                        if( normalize_whitespace( $new_data[ $field ] ) != normalize_whitespace( $post[ $field ] ) ) {
+                                $post_has_changed = true;
+                                break;
+                        }
+                }
+                //don't save revision if post unchanged
+                if( ! $post_has_changed )
+                        return;
+        }
+
         $return = _wp_put_post_revision( $post );
 
         // WP_POST_REVISIONS = true (default), -1