XF 2.3 XF conditional to match 1st post only? That works for all thread types

[rdn]

I'm using this code:

<xf:if is="$post.position % $xf.options.messagesPerPage == 0">

On message_macros template, but it only works for normal thread type, not for article, poll, or question.

 

[rdn]

This code doesn't work also for other thread types.

<xf:if is="{$__globals.thread} AND {$__globals.post} AND {$__globals.thread.first_post_id} == {$__globals.post.post_id}">