[bzlmod] Silence Ignoring toolchain warning for duplicate toolchains with the same configuration

[keith]

With our project using bzlmod, rules_python, and grpc, with this setup in the MODULE.bazel:

python = use_extension("@rules_python//python/extensions:python.bzl", "python")
python.toolchain(
    ignore_root_user_error = True,
    is_default = True,
    python_version = "3.11",
)
use_repo(python, "python_3_11")

When building you see this warning:

DEBUG: .../python.bzl:45:10: WARNING: Ignoring toolchain 'python_3_11' from module 'grpc': Toolchain 'python_3_11' from module 'foo' already registered Python version 3.11 and has precedence

In this case it seems that grpc also registers a 3.11 toolchain when using it from bzlmod https://github.com/bazelbuild/bazel-central-registry/blob/5958c06f2695493509c6b8ad64c2774b2e25925c/modules/grpc/1.56.3.bcr.1/patches/python.patch#L22-L26

Which produces this through this code

rules_python/python/private/bzlmod/python.bzl

Line 144 in c5c03b2

if mod.name != "rules_python" or not first.module.is_root:

In this case it doesn't seem like it's a problem, or that I can do anything about it? So I think it would be nice if it didn't produce a warning. Looking at the condition I am wondering if it is meant to be an and instead, since first.module.is_root == True in this case, but I don't understand the intent enough.

🌍 Your Environment

Operating System: macOS
Output of bazel version: 7.1.1
Rules_python version: HEAD