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< function page_title_page_get_title() {
---
> function page_title_page_get_title($passed_title = '') {
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>       else {
>         // If this is not a recognized page type, use the passed value.
>         $page_title_pattern = $passed_title;
>       }
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<       // If pattern is emtpy (either if the type is not overridable or simply not set) fallback to the default pattern)
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<   $vars['head_title'] = page_title_page_get_title();
---
>   // Pass the var title in as a fallback (this makes panels work).
>   $vars['head_title'] = page_title_page_get_title($vars['head_title']);