Resolver.php

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

class Resolver implements \Magento\Framework\View\Design\Theme\ResolverInterface
{
    protected $design;

    protected $themeFactory;

    protected $appState;

    public function __construct(
        \Magento\Framework\App\State $appState,
        \Magento\Framework\View\DesignInterface $design,
        \Magento\Theme\Model\ResourceModel\Theme\CollectionFactory $themeFactory
    ) {
        $this->design = $design;
        $this->themeFactory = $themeFactory;
        $this->appState = $appState;
    }

    public function get()
    {
        $area = $this->appState->getAreaCode();
        if ($this->design->getDesignTheme()->getArea() == $area || $this->design->getArea() == $area) {
            return $this->design->getDesignTheme();
        }

        $themeCollection = $this->themeFactory->create();
        $themeIdentifier = $this->design->getConfigurationDesignTheme($area);
        if (is_numeric($themeIdentifier)) {
            $result = $themeCollection->getItemById($themeIdentifier);
        } else {
            $themeFullPath = $area . \Magento\Framework\View\Design\ThemeInterface::PATH_SEPARATOR . $themeIdentifier;
            $result = $themeCollection->getThemeByFullPath($themeFullPath);
        }
        return $result;
    }
}