container: fix call to protected method

Author: ext

CHANGELOG.md

@@ -1,3 +1,10 @@
+# 1.4.1
+
+## Bugfixes
+
+  - Fix call to protected method generate_data when nesting FormSelect
+    in containers.
+
 # 1.4.0
 
 ## Breaking changes

src/lib/FormContainer.php

@@ -256,7 +256,7 @@ public function fields_for($id, $obj, $callback){
 		$this->form->fields_for($id, $obj, $callback, $this);
 	}
 
-	protected function generate_data($key, array &$attr){
+	public function generate_data($key, array &$attr){
 		return $this->form->generate_data($key, $attr);
 	}
 }