DesignTheme.php

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<?php
namespace Magento\Theme\Model\Config\Processor;

use Magento\Framework\App\Config\Spi\PreProcessorInterface;
use Magento\Framework\Stdlib\ArrayManager;
use Magento\Framework\View\Design\Theme\ListInterface;
use Magento\Framework\View\DesignInterface;

class DesignTheme implements PreProcessorInterface
{
    private $arrayManager;

    private $themeList;

    public function __construct(
        ArrayManager $arrayManager,
        ListInterface $themeList
    ) {
        $this->arrayManager = $arrayManager;
        $this->themeList = $themeList;
    }

    public function process(array $config)
    {
        foreach ($config as $scope => &$item) {
            if ($scope === \Magento\Framework\App\Config\ScopeConfigInterface::SCOPE_TYPE_DEFAULT) {
                $item = $this->changeThemeFullPathToIdentifier($item);
            } else {
                foreach ($item as &$scopeItems) {
                    $scopeItems = $this->changeThemeFullPathToIdentifier($scopeItems);
                }
            }
        }

        return $config;
    }

    private function changeThemeFullPathToIdentifier($configItems)
    {
        $theme = null;
        $themeIdentifier = $this->arrayManager->get(DesignInterface::XML_PATH_THEME_ID, $configItems);
        if (!empty($themeIdentifier)) {
            if (!is_numeric($themeIdentifier)) {
                // workaround for case when db is not available
                try {
                    $theme = $this->themeList->getThemeByFullPath($themeIdentifier);
                } catch (\DomainException $domainException) {
                    $theme = null;
                }
            }

            if ($theme && $theme->getId()) {
                return $this->arrayManager->set(DesignInterface::XML_PATH_THEME_ID, $configItems, $theme->getId());
            }
        }

        return $configItems;
    }
}