Issue #3490176 by jurgenhaas: Allow to extend ProjectBrowserSource plugins

Closes #3490176

src/Plugin/ProjectBrowserSource/Recipes.php

@@ -28,12 +28,12 @@ use Symfony\Component\Finder\Finder;
 class Recipes extends ProjectBrowserSourceBase {
 
   public function __construct(
-    private readonly FileSystemInterface $fileSystem,
-    private readonly CacheBackendInterface $cacheBin,
-    private readonly ModuleExtensionList $moduleList,
-    private readonly FileUrlGeneratorInterface $fileUrlGenerator,
-    private readonly ConfigFactoryInterface $configFactory,
-    private readonly string $appRoot,
+    protected readonly FileSystemInterface $fileSystem,
+    protected readonly CacheBackendInterface $cacheBin,
+    protected readonly ModuleExtensionList $moduleList,
+    protected readonly FileUrlGeneratorInterface $fileUrlGenerator,
+    protected readonly ConfigFactoryInterface $configFactory,
+    protected readonly string $appRoot,
     mixed ...$arguments,
   ) {
     parent::__construct(...$arguments);
@@ -165,7 +165,7 @@ class Recipes extends ProjectBrowserSourceBase {
    * @return \Symfony\Component\Finder\Finder
    *   A Symfony Finder object, configured to find locally installed recipes.
    */
-  private function getFinder(): Finder {
+  protected function getFinder(): Finder {
     $search_in = [$this->appRoot . '/core/recipes'];
 
     // If any recipes have been installed by Composer, also search there. The