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I've created a Smarty function
/library/vendors/SmartyPlugins/function.categoriesdiscussions_link.php and can now use it as expected. When I placed that file in a custom theme, I could not use it... :-(
Is there any way to store and access that file in my "own" folder or do I really have to clutter the core? I've searched for an answer but only found two unanswered questions: