cargo::redundant_readme false positive when having multiple readme candidates #17206

#[cargo_test]
fn lower_priority_readme() {
    let p = project()
        .file(
            "Cargo.toml",
            r#"
[package]
name = "foo"
edition = "2015"
readme = "README.txt"

[lints.cargo]
default = { level = "allow", priority = -1 }
redundant_readme = "warn"
"#,
        )
        .file("src/main.rs", "fn main() {}")
        .file("README.md", "")
        .file("README.txt", "")
        .build();

    p.cargo("fetch -Zcargo-lints")
        .masquerade_as_nightly_cargo(&["cargo-lints"])
        .with_stderr_data(str![[r#"
[WARNING] explicit `package.readme` can be inferred
 --> Cargo.toml:6:1
  |
6 | readme = "README.txt"
  | ^^^^^^^^^^^^^^^^^^^^^
  |
  = [NOTE] `cargo::redundant_readme` is set to `warn` in `[lints]`
[HELP] consider removing `package.readme`
[WARNING] `foo` (manifest) generated 1 warning

"#]])
        .run();
}