Feature upgrade to9 lts

Classes/Controller/BackendController.php

@@ -37,9 +37,11 @@ use TYPO3\CMS\Core\Database\Query\Restriction\DeletedRestriction;
 use TYPO3\CMS\Core\Imaging\Icon;
 use TYPO3\CMS\Core\Imaging\IconFactory;
 use TYPO3\CMS\Core\Messaging\FlashMessage;
+use TYPO3\CMS\Core\Page\PageRenderer;
 use TYPO3\CMS\Core\Utility\GeneralUtility;
 use TYPO3\CMS\Core\Utility\VersionNumberUtility;
 use TYPO3\CMS\Extbase\Mvc\Controller\ActionController;
+use TYPO3\CMS\Extbase\Mvc\View\ViewInterface;
 use TYPO3\CMS\Extbase\Utility\LocalizationUtility;
 
 /**
@@ -96,6 +98,20 @@ class BackendController extends ActionController {
 		$this->frontendUserService = $frontendUserService;
 	}
 
+	/**
+	 * @param ViewInterface $view
+	 */
+	public function initializeView(ViewInterface $view) {
+		parent::initializeView($view);
+		$pageRenderer = GeneralUtility::makeInstance(PageRenderer::class);
+		$pageRenderer->addJsInlineCode('typo3_version', 'TYPO3.version='
+			. VersionNumberUtility::convertVersionNumberToInteger(VersionNumberUtility::getCurrentTypo3Version())
+			. ';');
+		if (version_compare(VersionNumberUtility::getCurrentTypo3Version(), '9.0.0', '<')) {
+			$pageRenderer->loadExtJS();
+		}
+	}
+
 	/**
 	 * Show FE user list for the current page or page list with FE user records
 	 *