Manager::getRequiredTabs

public function getRequiredTabs()
{
	return array_reduce(array_keys($this->tabList),
		function ($result, $tabId) {
			/**
			 * @type Tabable $tab
			 */
			$tab = $this->tabList[$tabId];
			if ($tab->canBeRemoved() === false && $tab->isAvailable())
			{
				$result[$tabId] = $tab->defaultSortValue();
			}

			return $result;
		}, []);
}