[!!!][TASK] Remove obsolete DeeplPreviewFlagGeneratePageHook

Since TYPO3 v12 `contentPostProc-all` hook is not called and replaced
with PSR-14 event `AfterCacheableContentIsGeneratedEvent`, which has
been respected with

* #397
* #398

TYPO3 v11 support has been removed and this change cleansup introduced
dual version code with upporting the bugfix as a housekeeping change.
Further, the now obsolete hook is completly removed.

Related: #397
Related: #398

Author: sbuerk

Classes/Event/Listener/RenderTranslatedFlagInFrontendPreviewMode.php

@@ -7,13 +7,11 @@
 use TYPO3\CMS\Core\Context\Context;
 use TYPO3\CMS\Frontend\Controller\TypoScriptFrontendController;
 use TYPO3\CMS\Frontend\Event\AfterCacheableContentIsGeneratedEvent;
-use WebVision\Deepltranslate\Core\Hooks\DeeplPreviewFlagGeneratePageHook;
 
 /**
  * Event listener to render the frontend preview flag information.
  *
- * TYPO3 v12+ only and this is the counter-part of the {@see DeeplPreviewFlagGeneratePageHook} for older TYPO3 versions.
- * https://docs.typo3.org/c/typo3/cms-core/main/en-us/Changelog/12.0/Breaking-97862-HooksRelatedToGeneratingPageContentRemoved.html
+ * @internal for `deepltranslate-core` internal usage and not part of public API.
  */
 final class RenderTranslatedFlagInFrontendPreviewMode
 {

Classes/Hooks/DeeplPreviewFlagGeneratePageHook.php

@@ -9,7 +9,6 @@
 use TYPO3\CMS\Core\Cache\CacheManager;
 use TYPO3\CMS\Core\Cache\Frontend\FrontendInterface;
 use TYPO3\CMS\Core\DependencyInjection\SingletonPass;
-use TYPO3\CMS\Core\Information\Typo3Version;
 use TYPO3\CMS\Dashboard\WidgetRegistry;
 use WebVision\Deepltranslate\Core\Client;
 use WebVision\Deepltranslate\Core\ClientInterface;
@@ -35,8 +34,6 @@
 use WebVision\Deepltranslate\Core\Widgets\UsageWidget;
 
 return function (ContainerConfigurator $containerConfigurator, ContainerBuilder $containerBuilder) {
-    $typo3version = new Typo3Version();
-
     $services = $containerConfigurator
         ->services();
     $services->defaults()
@@ -162,17 +159,14 @@
             ]
         );
 
-    if ((new Typo3Version())->getMajorVersion() >= 12) {
-        // @todo Unnest this in next major when TYPO3 v11 support has been removed.
-        $services
-            ->set(RenderTranslatedFlagInFrontendPreviewMode::class)
-            ->tag(
-                'event.listener',
-                [
-                    'identifier' => 'deepltranslate-core/render-translated-flag-in-frontend-preview-mode',
-                ]
-            );
-    }
+    $services
+        ->set(RenderTranslatedFlagInFrontendPreviewMode::class)
+        ->tag(
+            'event.listener',
+            [
+                'identifier' => 'deepltranslate-core/render-translated-flag-in-frontend-preview-mode',
+            ]
+        );
 
     /**
      * Check if WidgetRegistry is defined, which means that EXT:dashboard is available.

Configuration/Services.php

@@ -26,12 +26,6 @@
     $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_tcemain.php']['checkModifyAccessList']['deepl']
         = \WebVision\Deepltranslate\Core\Hooks\TCEmainHook::class;
 
-    if ($typo3version->getMajorVersion() < 12) {
-        // @todo Remove when TYPO3 v11 support is removed.
-        $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_fe.php']['contentPostProc-all']['deepl-1675946132'] =
-            \WebVision\WvDeepltranslate\Hooks\DeeplPreviewFlagGeneratePageHook::class . '->renderDeeplPreviewFlag';
-    }
-
     //xclass localizationcontroller for localizeRecords() and process() action
     $GLOBALS['TYPO3_CONF_VARS']['SYS']['Objects'][\TYPO3\CMS\Backend\Controller\Page\LocalizationController::class] = [
         'className' => \WebVision\Deepltranslate\Core\Override\LocalizationController::class,