- Added CSRF through form processing

src/Form/UiInput.php

@@ -43,7 +43,7 @@ class UiInput extends UiElement implements Extension {
         }
 
         if ($attributes['class'] ?? false) {
-            $attributes['class'] .= " {$this->attributes['class']}";
+            $attributes['class'] = implode(" ", array_merge((array) $attributes['class'], (array) $this->attributes['class']));
             unset($this->attributes['class']);
         }