Checkbox settings not appearing on pane summary

Please break off either the bug report or the feature request in a separate issue. Thanks!

Needs work for separate issue.

Going to commit the fix to the bug report. Please open a new issue for the feature request.

Need to use isset on the initial check, because !empty will skip the summary when the box is not checked.

    if (isset($new_window)) {
      $window_text = ($new_window == 1) ? $this->t('New window') : $this->t('Same window');
      $summary .= $this->t('Window opens in: @text', ['@text' => $window_text]) . '<br/>';