Ignore option still reads rustfmt.toml from excluded folders

[JakkuSakura]

Describe the bug
Ignore option still reads rustfmt.toml from excluded folders

To Reproduce

tree         
├── Cargo.lock
├── Cargo.toml
├── patched
│   └── webpki
│       ├── Cargo.toml
│       ├── rustfmt.toml  < 'merge_imports=true'
│       └── src
│           └── webpki.rs
└── rustfmt.toml  < 'ignore = ["patched",]'


cargo fmt                                  
Warning: the `merge_imports` option is deprecated. Use `imports_granularity=Crate` instead

example.zip

Expected behavior
no output

Meta

• rustfmt version: rustfmt 1.4.36-nightly (7de6968 2021-02-07)
• From where did you install rustfmt?: rustup component add rustfmt
• How do you run rustfmt: cargo fmt

[calebcartwright]

Thanks for reporting. I don't recall off hand if we load/parse/interpret the config files as part of recursively loading them, but I suppose it would make sense to avoid if we can.

ignore is really about whether or not to apply formatting changes though at runtime though, everything still gets parsed