[com_fields] Fix front end articles category switch (#17872)

* Fix front end articles category switch

* Check if it is allowed to add an article

components/com_content/controllers/article.php

@@ -172,7 +172,7 @@ public function cancel($key = 'a_id')
 			$cancelMenuitemId = (int) $params->get('cancel_redirect_menuitem');
 
 			if ($cancelMenuitemId > 0)
-			{				
+			{
 				$item = $app->getMenu()->getItem($cancelMenuitemId);
 				$lang = '';
 
@@ -389,6 +389,21 @@ public function save($key = null, $urlVar = 'a_id')
 		return $result;
 	}
 
+	/**
+	 * Method to reload a record.
+	 *
+	 * @param   string  $key     The name of the primary key of the URL variable.
+	 * @param   string  $urlVar  The name of the URL variable if different from the primary key (sometimes required to avoid router collisions).
+	 *
+	 * @return  void
+	 *
+	 * @since   __DEPLOY_VERSION__
+	 */
+	public function reload($key = null, $urlVar = 'a_id')
+	{
+		return parent::reload($key, $urlVar);
+	}
+
 	/**
 	 * Method to save a vote.
 	 *

libraries/src/MVC/Controller/FormController.php

@@ -873,7 +873,11 @@ public function reload($key = null, $urlVar = null)
 
 		$recordId = $this->input->getInt($urlVar);
 
-		if (!$this->allowEdit($data, $key))
+		// Populate the row id from the session.
+		$data[$key] = $recordId;
+
+		// Check if it is allowed to edit or create the data
+		if (($recordId && !$this->allowEdit($data, $key)) || (!$recordId && !$this->allowAdd($data)))
 		{
 			$this->setRedirect(
 				\JRoute::_(
@@ -884,9 +888,6 @@ public function reload($key = null, $urlVar = null)
 			$this->redirect();
 		}
 
-		// Populate the row id from the session.
-		$data[$key] = $recordId;
-
 		// The redirect url
 		$redirectUrl = \JRoute::_(
 			'index.php?option=' . $this->option . '&view=' . $this->view_item .