Ticket #20564: 20564.23.diff

src/wp-admin/includes/post.php

@@ -1541 +1541 @@
                         return 0;
                 }
 
+                /**
+                 * Fires before an autosave is stored.
+                 *
+                 * @since 4.1.0
+                 *
+                 * @param Object $new_autosave Post object - the autosave that is about to be saved.
+                 */
+                do_action( '_wp_creating_autosave', $new_autosave );
+
                 return wp_update_post( $new_autosave );
         }
 

src/wp-admin/includes/revision.php

@@ -92 +92 @@
                         );
                 }
         }
-        return $return;
+
+        /**
+         * Filter the fields displayed in the revision diff UI
+         *
+         * @since 4.1.0
+         *
+         * @param array   $return       Revision UI fields. Each item is an array of id, name and diff.
+         * @param WP_POST $compare_from The revision post object to compare from.
+         * @param WP_Post $compare_to   The revision post object to compare to.
+         */
+        return apply_filters( 'wp_get_revision_ui_diff', $return, $compare_from, $compare_to );
+
 }
 
 /**

src/wp-includes/revision.php

@@ -133 +133 @@
                                         break;
                                 }
                         }
+
+                        /**
+                         * Filter whether a post has changed.
+                         *
+                         * By default a revision is saved only if one of the revisioned fields has changed.
+                         * This filter allows for additional checks to determine if there were changes.
+                         *
+                         * @since 4.1.0
+                         *
+                         * @param bool $post_has_changed Whether the post has changed.
+                         * @param int  $last_revision    ID of the last revision.
+                         * @param int  $post             Post ID.
+                         *
+                         */
+                        $post_has_changed = (bool) apply_filters( 'wp_save_post_revision_additional_check_for_changes', $post_has_changed, $last_revision, $post );
+
                         //don't save revision if post unchanged
-                        if( ! $post_has_changed )
+                        if( ! $post_has_changed ) {
                                 return;
+                        }
                 }
         }