This is a feature I’d like for my personal overrides; there are some patches out there that I want to reference from my common configs but they aren’t in unified format, and I was surprised when fetchpatch couldn’t handle them. Not sure if it’s too disruptive to do it like this, though.
https://github.com/NixOS/nixpkgs/pull/226974
https://github.com/NixOS/nixpkgs/pull/226506
https://github.com/NixOS/nixpkgs/pull/225829
https://github.com/NixOS/nixpkgs/pull/226032
https://github.com/NixOS/nixpkgs/pull/226727