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

[rdn]

I'm using this code:
PHP:

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

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