XenForo Conditional: thread creator is member of

[Nicolas FR]

Hello, i'm trying to set a conditional statement saying if thread creator is member of usegroup_X then...
Can't figure it out since yesterday afternoon !

HTML:

<xf:if is="{$thread.user_id} ==  {$xf.visitor.user_id} AND {$thread.user_id}.isMemberOf(3)">
    ...
</xf:if>

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