MassactionKey.php

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<?php
namespace Magento\Backend\App\Action\Plugin;

use Magento\Framework\App\RequestInterface;
use Magento\Backend\App\AbstractAction;

class MassactionKey
{
    public function beforeDispatch(AbstractAction $subject, RequestInterface $request)
    {
        $key = $request->getPost('massaction_prepare_key');
        if ($key) {
            $postData = $request->getPost($key);
            $value = is_array($postData) ? $postData : explode(',', $postData);
            $request->setPostValue($key, $value ? $value : null);
        }
    }
}