`no-useless-split-diff-view` is broken on GitHub Enterprise #4483

here's how a recent diff looks with this feature enabled:

What do you think changed in this commit? Well it looks like that line was added - but it wasn't. The normal split diff looks like this:

You can see there's a subtle difference between the commits which is actually very important (there was a bug!)

Originally posted by @danielsamuels in https://github.com/sindresorhus/refined-github/issues/4399#issuecomment-863023847

Strange, can't replicate.

Diff that's correctly unified: https://github.com/sindresorhus/refined-github/commit/f60cb71e0bc2708ebda622d6c684489241fd367a

Reportedly problematic diff: https://github.com/sindresorhus/refined-github/commit/26e778fd85f7db6c3d5bc6f508e23c77f3ed4a20

Originally posted by @fregante in https://github.com/sindresorhus/refined-github/issues/4399#issuecomment-863172312

This is on a GitHub Enterprise instance running 2.22.10, perhaps it's an incompatibility with that version?

Originally posted by @danielsamuels in https://github.com/sindresorhus/refined-github/pull/4399#issuecomment-863173685

I think I know what's happening. It checks the left column first, it doesn't find the expected element ([data-split-side="${side}"]:is(.blob-code-addition, .blob-code-deletion)) and therefore it assumes it's empty.

Originally posted by @fregante in https://github.com/sindresorhus/refined-github/pull/4399#issuecomment-863175358