Just to clarify, this is with the NodeBB forum I linked to right? Not the Discourse equivalent that was later shared here? Discourse added posts without needing to recalculate the height/layout. NodeBB would keep shifting posts for me if I had scrolled up(scrollbar) and then stopped to read a post, images loaded on posts above it that forced the one I was reading down, and on my connection(with Chrome) that happened a few times as I scrolled back down chasing the same post.
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