Manager::onImopenlineDelete

static function onImopenlineDelete(\Bitrix\Main\Event $eventData): void
{
	$lineId = (int)$eventData->getParameter('line');
	$widgets = self::getWidgetsByOpenlineId($lineId);
	foreach ($widgets as $widget)
	{
		// processing affected widgets, place your methods here
		self::deleteRelatedOpenlineForWidget($widget);
	}
}