Condition for if user is ignored?

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I noticed that by default, ignoring a post doesn't hide things like the avatar of the user, just the message. I'd like to modify this but am unsure where to begin.

Is there a condition that I can use to hide additional elements of users who are ignored?

For example: <if condition="$post[ignoreuser]">This person is ignored</if>

What's the best way of going about this? Thanks!