That partial is on all pages that display a list of topics ie /recent /unread /popular and /category pages. You need to create a plugin and add hooks for those pages the hook format is filter:<template_name>.build in those hooks you need to go through the topics array and subtract one from each topic's postcount.
Infinite scrolling search
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Why is not implemented in the search for the infinite scrolling?
https://community.nodebb.org/search/
