WorkgroupEvent::clearNotRealChanges

private function clearNotRealChanges(array $changed): array
{
	$realChanges = [
		'NAME',
		'PROJECT_DATE_START',
		'PROJECT_DATE_FINISH',
		'IMAGE_ID',
		'AVATAR_TYPE',
		'OPENED',
		'CLOSED',
		'VISIBLE',
		'PROJECT',
		'KEYWORDS',
	];

	foreach ($changed as $key => $groupId)
	{
		$changes = $this->getChanges($groupId);
		if (!array_intersect_key($changes, array_flip($realChanges)))
		{
			unset($changed[$key]);
		}
	}

	return $changed;
}