Images not working in template when using language path prefix

Hi!
When preprocessing variables for htmlmail.tpl.php template at template_preprocess_htmlmail(), it defines the $theme_url variable which could be used for images in the email like in my use case.

It works fine in most of the cases, but if you use language path prefix (e.q. http://www.example.com/de), the $theme_url variable gets wrong.

// htmlmail.module:125
$variables['theme_url'] = url(
    $variables['theme_path'], array('absolute' => TRUE)
  );

Related issues:

• #1071164: $path is wrong in non default language
• #1916360: Image not working