Issue #3495305 by phenaproxima: Recipes that depend on other recipes break RecipeInputFormTrait

(cherry picked from commit ac347da7)

core/lib/Drupal/Core/Recipe/InputConfigurator.php

@@ -25,11 +25,11 @@ final class InputConfigurator {
   private array $data = [];
 
   /**
-   * The collected input values, or NULL if none have been collected yet.
+   * The collected input values.
    *
-   * @var mixed[]|null
+   * @var mixed[]
    */
-  private ?array $values = NULL;
+  private array $values = [];
 
   /**
    * @param array<string, array<string, mixed>> $definitions
@@ -96,7 +96,7 @@ public function getDataDefinitions(): array {
    *   The collected input values, keyed by name.
    */
   public function getValues(): array {
-    return $this->values ?? [];
+    return $this->values;
   }
 
   /**
@@ -131,13 +131,15 @@ public function describeAll(): array {
    * @throws \Symfony\Component\Validator\Exception\ValidationFailedException
    *   Thrown if any of the collected values violate their validation
    *   constraints.
+   * @throws \LogicException
+   *   Thrown if input values have already been collected for this recipe.
    */
   public function collectAll(InputCollectorInterface $collector, array &$processed = []): void {
     // Don't bother collecting values for a recipe we've already seen.
     if (in_array($this->prefix, $processed, TRUE)) {
       return;
     }
-    if (is_array($this->values)) {
+    if ($this->values) {
       throw new \LogicException('Input values cannot be changed once they have been set.');
     }
     // First, collect values for the recipe's dependencies.
@@ -146,7 +148,6 @@ public function collectAll(InputCollectorInterface $collector, array &$processed
       $dependency->input->collectAll($collector, $processed);
     }
 
-    $this->values = [];
     foreach ($this->data as $key => $data) {
       $definition = $data->getDataDefinition();
 

core/modules/system/tests/src/Functional/Form/RecipeFormInputTest.php

@@ -39,6 +39,7 @@ public function testRecipeInputViaForm(): void {
     // All recipe inputs are required, except for checkboxes, for which that
     // behavior makes no sense.
     $this->submitForm(['input_test[owner]' => ''], 'Apply recipe');
+    $assert_session->statusCodeEquals(200);
     $assert_session->statusMessageContains("Site owner's name field is required.", 'error');
     $assert_session->statusMessageNotContains('Allow mischief field is required.', 'error');
     // All inputs should be validated with their own constraints.

core/tests/fixtures/recipes/input_test/recipe.yml

 name: Input Test
+recipes:
+  # Depend on another recipe in order to prove that we can collect input
+  # from recipes that depend on other recipes.
+  - no_extensions
 input:
   owner:
     data_type: string