Issue #3335656 by yas, sekinet: Refactor the OpenStack Heat name so that spaces cannot be entered

modules/cloud_service_providers/openstack/src/Form/OpenStackStackCreateExtraForm.php

@@ -261,6 +261,24 @@ class OpenStackStackCreateExtraForm extends AwsCloudContentForm {
     $this->tempStore->delete('environment');
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function validateForm(array &$form, FormStateInterface $form_state): void {
+    parent::validateForm($form, $form_state);
+
+    $name = $form_state->getValue('name') ?? '';
+
+    // @see https://docs.openstack.org/api-ref/orchestration/v1/index.html#create-stack
+    if (!empty($name)
+      && !preg_match('/^[a-zA-Z][a-zA-Z0-9_.-]{0,254}$/', $name)) {
+      $form_state->setError($form, $this->t("The @type %name is invalid:<ul><li>Must be unique within the project.</li><li>Must begin with an ASCII character.</li><li>It cannot contain anything other than ASCII characters, numbers, underscores, periods, and hyphens.</li></ul>", [
+        '@type' => $this->getShortEntityTypeNameWhitespace($this->entity),
+        '%name' => $name,
+      ]));
+    }
+  }
+
   /**
    * Build template parameters.
    *