Revert "Don't filter form data on reload (#28103)"

This reverts commit ab67635.

Author: HLeithner

libraries/src/MVC/Controller/FormController.php

@@ -911,8 +911,20 @@ public function reload($key = null, $urlVar = null)
 			false
 		);
 
+		// Validate the posted data.
+		// Sometimes the form needs some posted data, such as for plugins and modules.
+		$form = $model->getForm($data, false);
+
+		if (!$form)
+		{
+			$app->enqueueMessage($model->getError(), 'error');
+
+			$this->setRedirect($redirectUrl);
+			$this->redirect();
+		}
+
 		// Save the data in the session.
-		$app->setUserState($this->option . '.edit.' . $this->context . '.data', $data);
+		$app->setUserState($this->option . '.edit.' . $this->context . '.data', $form->filter($data));
 
 		$this->setRedirect($redirectUrl);
 		$this->redirect();