Formatter removes method signature keyword

With this code
```
traitAppendQueryFilter($query, $filter);
}

protected function filterAttributes($attributes)
{
$fields = array_merge($this->fields, $this->langFields);

return array_intersect_key(
$attributes,
array_flip($fields)
);
}
}
```
formatter removes `protected` keywords.

When I remove trait use it works right.