MenuItemChecker.php

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<?php
namespace Magento\Backend\Block;

use Magento\Backend\Model\Menu\Item;

class MenuItemChecker
{
    public function isItemActive($activeItem, Item $item, $level)
    {
        $output = false;

        if ($level == 0
            && $activeItem instanceof \Magento\Backend\Model\Menu\Item
            && $this->isActiveItemEqualOrChild($activeItem, $item)
        ) {
            $output = true;
        }
        return $output;
    }

    private function isActiveItemEqualOrChild($activeItem, $item)
    {
        return ($activeItem->getId() == $item->getId())
        || ($item->getChildren()->get($activeItem->getId()) !== null);
    }
}