Ticket #21062: add-template-file-hook.diff

wp-includes/template.php

@@ -386 +386 @@
         if ( is_array( $wp_query->query_vars ) )
                 extract( $wp_query->query_vars, EXTR_SKIP );
 
+        $_template_file = apply_filters( 'template_file', $_template_file, $require_once );
+
         if ( $require_once )
                 require_once( $_template_file );
         else