/**
* Save time stamp of last change
*
* @param EventObserver $event
* @return void
*/
public function saveChangeTime($event)
{
/** @var $theme \Magento\Theme\Model\Theme|null */
$theme = $event->getTheme() ?: $event->getDataObject()->getTheme();
/** @var $change \Magento\DesignEditor\Model\Theme\Change */
$change = $this->objectManager->create('Magento\\DesignEditor\\Model\\Theme\\Change');
if ($theme && $theme->getId()) {
$change->loadByThemeId($theme->getId());
$change->setThemeId($theme->getId())->setChangeTime(null);
$change->save();
}
}