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I don't think this was the case in 2016 though.

They added it to the UI in 2018 but you could do it via URL since 2011.

> A diff view with reduced white space has been available since 2011 by adding ?w=1 to the URL.

https://github.blog/2018-05-01-ignore-white-space-in-code-re...

Also, Git had it since forever, and since GitHub's diff view isn't particularly convenient for browsing multi-commit PRs you usually review the changes using Git anyway.

That said, I'd ask the contributor to tidy up the branch first. It's kinda disrespecting to ask others to review branches in such state.

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