Return the base path to use for this display.
This can be overridden for displays that do strange things with the path.
public function getPath() {
  if ($this
    ->hasPath()) {
    return $this
      ->getOption('path');
  }
  $display_id = $this
    ->getLinkDisplay();
  if ($display_id && $this->view->displayHandlers
    ->has($display_id) && is_object($this->view->displayHandlers
    ->get($display_id))) {
    return $this->view->displayHandlers
      ->get($display_id)
      ->getPath();
  }
}