Issue #3438472: Drupal 11 compatibility fixes for markdown

src/Annotation/ComposerPackage.php

@@ -27,13 +27,6 @@ class ComposerPackage extends InstallableLibrary {
   protected function detectVersion() {
     $id = $this->getId();
 
-    // Composer 1 support.
-    // @todo Remove in 4.0.0.
-    // @see https://www.drupal.org/project/markdown/issues/3200476
-    if (!class_exists('\Composer\InstalledVersions')) {
-      return Composer::getInstalledVersion($id) ?: Composer::getVersionFromClass($this->object);
-    }
-
     // Composer 2+ runtime installed versions support.
     // @see https://getcomposer.org/doc/07-runtime.md#knowing-the-version-of-package-x
     if (InstalledVersions::isInstalled($id)) {