Odd code in views_ui_rearrange_form

This code can't really be right, as it get's all relationship handlers twice, so this seems to be an algorithm N^2

<?php
  // Get relationship labels
  $relationships = array();
  foreach ($display->handler->getHandlers('relationship') as $id => $handler) {
    $relationships[$id] = $handler->label();
    $handlers = $display->handler->getOption('relationships');
    if ($handlers) {
      foreach ($handlers as $id => $info) {
        $handler = $display->handler->getHandler('relationship', $id);
        $relationships[$id] = $handler->label();
      }
    }
  }
?>