- Added multi-part by default to forms

- Fixed some bug within FormContext and FormHandler.

src/Form/UiForm.php

@@ -55,11 +55,13 @@ class UiForm extends UiElement implements Extension {
         $method = strtolower($method);
         
         $this->option('tag-type', 'single');
+        
         $this->attributes([ 'method' => $method, 'action' => $action ] + $attributes);
         
         if ( $method !== "get" ) {
             $this->append( ( new UiHidden() )->attributes([ 'name' =>"picea-csrf-protection", 'value' => "abcdefg" ]) );
-        } 
+            $this->attributes([ 'enctype' => "multipart/form-data" ]);
+        }
         
         return $this->render() . PHP_EOL;
     }