What method are you using to stop the non-matched
content being displayed?
How much empty space? A blank line or two, or the entire space the
non-matched content would take up were it displayed?
I match the wanted tags by using following syntax...
function wfRenderArticleSectionCheck($input, $args, &$parser) {
global $wgTitle, $wgArticle, $wgParser, $wgLang, $wgLanguageCode;
$lan = $wgLang->getCode();
if($args[lan] == $lan) {
return $input;
} else {
return '';
}
}
The empty space is conform with the entire space the non-matched content would
take up...