Overrides \Drupal\views\Plugin\views\area\TokenizeAreaPluginBase::buildOptionsForm().
Overrides TokenizeAreaPluginBase::buildOptionsForm
public function buildOptionsForm(&$form, &$form_state) {
parent::buildOptionsForm($form, $form_state);
$form['content'] = array(
'#type' => 'text_format',
'#default_value' => $this->options['content'],
'#rows' => 6,
'#format' => isset($this->options['format']) ? $this->options['format'] : filter_default_format(),
'#wysiwyg' => FALSE,
);
}