PSA that you ought to use difftastic for your diffs:
difftastic.wilfred.me.uk/

It's an easy install and the resulting output is honestly great.

(You can still get the old diff output when necessary by running e.g. `jj diff --git` or `git diff --no-ext-diff`.)

Also here's how to configure it with jj such that it properly diffs across file renames:
github.com/jj-vcs/jj/discussio

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