[BUGFIX] Skip validation of form fields in disabled containers

Aside from being disabled itself, a form field can also be placed in a
container which is disabled statically or using variants. In either case
the field must not be validated since it is not rendered and thus cannot
be filled by the user.

Resolves: #102083
Releases: main, 12.4
Change-Id: I8f2bcd45d3563907bf5737628020ab8bf50a68bc
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/82004
Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>

typo3/sysext/form/Classes/Domain/Runtime/FormRuntime.php

@@ -49,6 +49,7 @@
 use TYPO3\CMS\Form\Domain\Model\FormDefinition;
 use TYPO3\CMS\Form\Domain\Model\FormElements\FormElementInterface;
 use TYPO3\CMS\Form\Domain\Model\FormElements\Page;
+use TYPO3\CMS\Form\Domain\Model\Renderable\RenderableInterface;
 use TYPO3\CMS\Form\Domain\Model\Renderable\RootRenderableInterface;
 use TYPO3\CMS\Form\Domain\Model\Renderable\VariableRenderableInterface;
 use TYPO3\CMS\Form\Domain\Renderer\RendererInterface;
@@ -568,7 +569,7 @@ protected function mapAndValidatePage(Page $page): Result
         }
 
         foreach ($page->getElementsRecursively() as $element) {
-            if (!$element->isEnabled()) {
+            if (!$this->isRenderableEnabled($element)) {
                 continue;
             }
 
@@ -1106,4 +1107,19 @@ protected function getTypoScriptFrontendController(): ?TypoScriptFrontendControl
     {
         return $GLOBALS['TSFE'] ?? null;
     }
+
+    protected function isRenderableEnabled(RenderableInterface $renderable): bool
+    {
+        if (!$renderable->isEnabled()) {
+            return false;
+        }
+
+        while ($renderable = $renderable->getParentRenderable()) {
+            if ($renderable instanceof RenderableInterface && !$renderable->isEnabled()) {
+                return false;
+            }
+        }
+
+        return true;
+    }
 }