SetAttributeTabBlockObserver.php

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<?php
namespace Magento\Bundle\Observer;

use Magento\Framework\Event\ObserverInterface;

class SetAttributeTabBlockObserver implements ObserverInterface
{
    protected $helperCatalog;

    public function __construct(\Magento\Catalog\Helper\Catalog $helperCatalog)
    {
        $this->helperCatalog = $helperCatalog;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $product = $observer->getEvent()->getProduct();
        if ($product->getTypeId() == \Magento\Catalog\Model\Product\Type::TYPE_BUNDLE) {
            $this->helperCatalog->setAttributeTabBlock(
                \Magento\Bundle\Block\Adminhtml\Catalog\Product\Edit\Tab\Attributes::class
            );
        }
        return $this;
    }
}