class Mini

PagerTest::testStorePagerSettings in drupal/core/modules/views/lib/Drupal/views/Tests/Plugin/PagerTest.php

Pagers was sometimes not stored.

class Mini extends SqlBase {

  /**
   * Overrides \Drupal\views\Plugin\views\pager\PagerPlugin::defineOptions().
   *
   * Provides sane defaults for the next/previous links.
   */
  public function defineOptions() {
    $options = parent::defineOptions();
    $options['tags']['contains']['previous']['default'] = '‹‹';
    $options['tags']['contains']['next']['default'] = '››';
    return $options;
  }

  /**
   * Overrides \Drupal\views\Plugin\views\pager\PagerPluginBase::summaryTitle().
   */
  public function summaryTitle() {
    if (!empty($this->options['offset'])) {
      return format_plural($this->options['items_per_page'], 'Mini pager, @count item, skip @skip', 'Mini pager, @count items, skip @skip', array(
        '@count' => $this->options['items_per_page'],
        '@skip' => $this->options['offset'],
      ));
    }
    return format_plural($this->options['items_per_page'], 'Mini pager, @count item', 'Mini pager, @count items', array(
      '@count' => $this->options['items_per_page'],
    ));
  }

  /**
   * Overrides \Drupal\views\Plugin\views\pager\SqlBase::query().
   */
  public function query() {
    parent::query();

    // Don't query for the next page if we have a pager that has a limited
    // amount of pages.
    if (empty($this->options['total_pages']) || $this
      ->getCurrentPage() < $this->options['total_pages']) {

      // Increase the items in the query in order to be able to find out whether
      // there is another page.
      $limit = $this->view->query
        ->getLimit();
      $limit += 1;
      $this->view->query
        ->setLimit($limit);
    }
  }

  /**
   * Overrides \Drupal\views\Plugin\views\pager\PagerPluginBase::useCountQuery().
   */
  public function useCountQuery() {
    return FALSE;
  }

  /**
   * Overrides \Drupal\views\Plugin\views\pager\PagerPluginBase::postExecute().
   */
  public function postExecute(&$result) {

    // In query() one more item might have been retrieved than necessary. If so,
    // the next link needs to be displayed and the item removed.
    if (count($result) > $this
      ->getItemsPerPage()) {
      array_pop($result);

      // Make sure the pager shows the next link by setting the total items to
      // the biggest possible number but prevent failing calculations like
      // ceil(PHP_INT_MAX) we take PHP_INT_MAX / 2.
      pager_default_initialize(PHP_INT_MAX / 2, $this
        ->getItemsPerPage(), $this->options['id']);
    }
  }

  /**
   * Overrides \Drupal\views\Plugin\views\pager\PagerPluginBase::render().
   */
  function render($input) {

    // The 1, 3 index are correct, see theme_pager().
    $tags = array(
      1 => $this->options['tags']['previous'],
      3 => $this->options['tags']['next'],
    );
    $output = theme($this
      ->themeFunctions(), array(
      'parameters' => $input,
      'element' => $this->options['id'],
      'tags' => $tags,
    ));
    return $output;
  }

}