bug: Home-Manager can't keep the order of options set for a program

[Andy3153]

Are you following the right branch?

• My Nixpkgs and Home Manager versions are in sync

Is there an existing issue for this?

• I have searched the existing issues

Issue description

As I said in the title, if I configure the options of a program with Home-Manager, the options do not keep their order and they go in the generated file in an alphabetic order. This is bad for some programs that need an order in their options, like in my case, MangoHud puts the overlay elements in the order they're in the config file.

From what I understand, nix does not store the order of attributes, so if HM doesn't implement something I didn't see to keep the order of declared options, providing a programs.*.settings for some programs is completely useless

Maintainer CC

I see that they @rycee @zeratax worked on the MangoHud configuration, so I'm mentioning them

System information

- system: `"x86_64-linux"`
 - host os: `Linux 6.8.6-zen1, NixOS, 24.05 (Uakari), 24.05.20240512.2057814`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.18.2`
 - nixpkgs: `/nix/var/nix/profiles/per-user/root/channels/nixos`