Ticket #29920: 29920.3.diff

src/wp-admin/edit-form-advanced.php

@@ -134 +134 @@
                 }
         }
         // If this autosave isn't different from the current post, begone.
-        if ( ! $notice )
+        if ( ! apply_filters( 'autosave_is_different_notice', $notice, $autosave, $post ) ) {
                 wp_delete_post_revision( $autosave->ID );
+        }
         unset($autosave_field, $_autosave_field);
 }
 

src/wp-admin/includes/post.php

@@ -1530 +1530 @@
                 $new_autosave['post_author'] = $post_author;
 
                 // If the new autosave has the same content as the post, delete the autosave.
-                $post = get_post( $post_id );
+                $post = get_post( $post_id, ARRAY_A );
                 $autosave_is_different = false;
                 foreach ( array_intersect( array_keys( $new_autosave ), array_keys( _wp_post_revision_fields() ) ) as $field ) {
-                        if ( normalize_whitespace( $new_autosave[ $field ] ) != normalize_whitespace( $post->$field ) ) {
+                        if ( normalize_whitespace( $new_autosave[ $field ] ) != normalize_whitespace( $post[ $field ] ) ) {
                                 $autosave_is_different = true;
                                 break;
                         }
                 }
 
-                if ( ! $autosave_is_different ) {
+                if ( ! apply_filters( 'autosave_is_different', $autosave_is_different, $new_autosave, $post ) ) {
                         wp_delete_post_revision( $old_autosave->ID );
                         return 0;
                 }