/**
  * Record differences for two branches.
  * @param PROJECT_ENTRY_BRANCH_INFO $orig_branch
  * @param PROJECT_ENTRY_BRANCH_INFO $new_branch
  * @access private
  */
 protected function _record_branch_differences($orig_branch, $new_branch)
 {
     if ($orig_branch->release_id != $new_branch->release_id) {
         $branch_title = $orig_branch->title_as_plain_text();
         $this->_record_object_difference("Release for branch [{$branch_title}]", $orig_branch->release(), $new_branch->release(), 'Current');
     }
 }