Changes pattern render from markup to inline

fix(PatternkitBlock.php)

Author: cybtachyon

src/Plugin/Block/PatternkitBlock.php

@@ -387,6 +387,8 @@ public function build() {
     $library_plugin = $this->patternLibraryPluginManager->createInstance($library_plugin_id);
     $elements = $library_plugin->render([$pattern]);
 
+    // @todo If context is available, tokenize context instead of the template.
+    // This is mostly useful for twig-based libraries.
     $markup = '';
     foreach ($elements as $element) {
       // Replace context tokens.
@@ -418,7 +420,10 @@ public function build() {
     }
 
     $content = [
-      '#markup'   => $markup,
+      'pattern'   => [
+        '#type' => 'inline_template',
+        '#template' => $markup,
+      ],
       '#attached' => $config['pkdata']['attachments'] ?? [],
     ];
     // Save to the cache bin (if caching is enabled).

src/Plugin/PatternLibrary/PatternLibraryTwig.php

@@ -59,6 +59,8 @@ public static function create(ContainerInterface $container, array $configuratio
    * {@inheritdoc}
    *
    * @throws \Throwable
+   *
+   * @todo Return render arrays for Twig only.
    */
   public function render(array $assets): array {
     $elements = [];