Issue #3304365: Do not check excluded folders for symlinks

package_manager/src/Event/CollectIgnoredPathsEvent.php

+<?php
+
+namespace Drupal\package_manager\Event;
+
+use Drupal\package_manager\Stage;
+use PhpTuf\ComposerStager\Domain\Value\PathList\PathListInterface;
+use PhpTuf\ComposerStager\Infrastructure\Value\PathList\PathList;
+
+/**
+ * Defines an event that collects ignored paths.
+ *
+ * Ignored paths are completely ignored by Composer Stager. They are never
+ * copied into the staging area from the active directory, or vice-versa.
+ */
+class CollectIgnoredPathsEvent extends StageEvent implements PathListInterface {
+
+  /**
+   * The list of ignored paths.
+   *
+   * @var \PhpTuf\ComposerStager\Domain\Value\PathList\PathListInterface
+   */
+  protected PathListInterface $pathList;
+
+  /**
+   * {@inheritdoc}
+   */
+  public function __construct(Stage $stage) {
+    parent::__construct($stage);
+    $this->pathList = new PathList([]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function add(array $paths): void {
+    $this->pathList->add($paths);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getAll(): array {
+    return $this->pathList->getAll();
+  }
+
+}

[Ted Bowman]

I don't know if we want to say never it is really for the next operation or status check.

[Ted Bowman]

I guess my point is what actually happens depends on the logic of the subscriber. I don't to get give the impression the fire the event 1x for the whole lifecycle of the update and if you add the exclusion it will be excluded in all stages. That depends on you ignoring the state of the stage