python311Packages.opencv4 does not install type stubs

[carschandler]

Describe the bug

A clear and concise description of what the bug is.

OpenCV started including Python type stubs (.pyi files) in version 4.8.0, which allow Python LSPs to provide completion and documentation for the package. When installing via nixpkgs, these are not included in the install.

This is all on nixpkgs-unstable via a devshell flake.

Steps To Reproduce

Steps to reproduce the behavior:

1. Install python3.withPackages pypkgs: [ pypkgs.opencv4 ]
2. Open an editor with an LSP installed and observe lack of completion
3. Inspect site-packages directory; no .pyi files installed for OpenCV.

Expected behavior

Type stubs are installed.

Additional context

It appears type stub generation occurs here:
https://github.com/opencv/opencv/blob/5e5a035c5bddbd0190f6cec8e9db90363f402799/modules/python/src2/typing_stubs_generation/generation.py#L132

Notify maintainers

@basvandijk
@SomeoneSerge

Metadata

Please run nix-shell -p nix-info --run "nix-info -m" and paste the result.

[user@system:~]$ nix-shell -p nix-info --run "nix-info -m"
 - system: `"x86_64-linux"`
 - host os: `Linux 5.15.133.1-microsoft-standard-WSL2, NixOS, 24.05 (Uakari), 24.05.20240205.faf912b`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.18.1`
 - channels(root): `"nixos-23.11, nixos-wsl"`
 - nixpkgs: `/nix/var/nix/profiles/per-user/root/channels/nixos`

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