Ticket #44786: autosave-allow-revision.diff

src/wp-includes/revision.php

@@ -109 +109 @@
  * @return int|WP_Error|void Void or 0 if error, new revision ID, if success.
  */
 function wp_save_post_revision( $post_id ) {
-        if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
+        $autosave = defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE;
+        /**
+         * Filters whether saving of revisions is allowed during autosaves.
+         * Normally, it is disallowed whenever the `DOING_AUTOSAVE` constant is truthy.
+         *
+         * @since 5.0.0
+         *
+         * @param bool    $allow Is saving of revisions allowed for autosaves.
+         */
+        if ( $autosave && ! apply_filters( 'allow_revisions_for_autosave', false ) ) {
                 return;
         }