Email::buildSubjectBlock

private function buildSubjectBlock(): ?ContentBlock
{
	$subject = (string)$this->getAssociatedEntityModel()->get('SUBJECT');
	if (empty($subject))
	{
		return null;
	}

	$subject = ContentBlockFactory::createTextOrLink($subject, $this->getTitleAction());
	return (new ContentBlockWithTitle())
		->setTitle(Loc::getMessage("CRM_TIMELINE_BLOCK_EMAIL_TITLE_THEME"))
		->setContentBlock($subject)
		->setInline();
}