Where is the _taxonomy_filter_filter_link_path($tids, $depth) function code?

Hello. I catch a bug when filter content by TF block.
Tomorrow I patch the dev code in my site, today got an update,
but nothing new about the bug, as I hope.

I didnt find _taxonomy_filter_filter_link_path($tids, $depth) code in the packadge.

My patch here, hope it clean to find and fix a problem in the Taxonomy Filter code.
Its just a hardcode, I'm not sure about side effects, but it's working.

--- taxonomy_filter_dev/tf_multi/tf_multi.module<------>2010-01-27 20:22:32.979287916 +0200
+++ taxonomy_filter/tf_multi/tf_multi.module<-->2010-01-08 16:11:46.000000000 +0200
@@ -203,8 +203,7 @@
   // TODO Make a depth function. This is also done in template_preprocess_taxonomy_filter_item.
   $depth = isset($variables['section_info']['section_settings']['depth']) ? $variables['section_info']['section_settings']['depth'] : 0;
   $depth = !$depth && isset($variables['block_info']['url_depth']) ? $variables['block_info']['url_depth'] : $depth;
-  // $attributes['href'] = _taxonomy_filter_filter_link_path($tids, $depth);
-  $attributes['href'] = _taxonomy_filter_format_path($tids, $depth);
+  $attributes['href'] = _taxonomy_filter_filter_link_path($tids, $depth);
.
   if ($variables['item']['info']['tf_multi']['selected']) {
     $link_text = $settings['subtract_prefix'];