Hi all,

on a fresh install of any eZ 4.1 (tested on 4.1.1 and 4.1.2), if in any class defined in the settings to be a folder, you add an attribute that permits you to upload files (an ezimage o ezfile attribute) then the folder is treated as a file instead of a container.
The problem is in eZWebDAVContentBackend class on (kernel/private/classes/webdav/ezwebdavcontentbackend.php) in the function isObjectFolder:

    protected function isObjectFolder( $object, &$class )
    {
        $classIdentifier = isset( $class->ClassIdentifier ) ? $class->ClassIdentifier : null;

        return in_array( $classIdentifier, $this->FolderClasses );
    }

it should be:

    protected function isObjectFolder( $object, &$class )
    {
        $classIdentifier = isset( $object->attribute('class_identifier') ) ? $object->attribute('class_identifier') : null;

        return in_array( $classIdentifier, $this->FolderClasses );
    }

Steps to reproduce

install eZ 4.1.2
add an ezimage attribute to the folder class
try to access folders via webdav