ItemHistory::getTimelineAction

protected function getTimelineAction(): ?string
{
	$action = $this->getAction();
	$actionsMap = [
		static::ACTION_ADD => Timeline::ACTION_ITEM_CREATE,
		static::ACTION_MOVE => Timeline::ACTION_STAGE_CHANGE,
		static::ACTION_UPDATE => Timeline::ACTION_FIELDS_CHANGE,
		static::ACTION_MOVE_UPDATE => Timeline::ACTION_STAGE_CHANGE,
		static::ACTION_TASK_COMPLETE => Timeline::ACTION_TASK_COMPLETE,
	];

	return $actionsMap[$action];
}