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## Summary
<!-- What's the purpose of the change? What does it do, and why? -->
Fixes #20035, fixes #19395
This is for deduplicating input paths to avoid processing the same file
multiple times.
This is my first contribution, so I'm sorry if I miss something. Please
tell me if this is needed for this feature.
## Test Plan
<!-- How was it tested? -->
I just added a test `find_python_files_deduplicated` in
eee1020e32/crates/ruff_workspace/src/resolver.rs (L1017)
. This pull request adds changes to `WalkPythonFilesState::finish`,
which is used in `python_files_in_path`, so they affect some commands
such as `analyze`, `format`, `check` and so on. I will add snapshot
tests for them if necessary.
I’ve already confirmed that the same thing happens with ruff check as
well.
```
$ echo "x = 1" > example/foo.py
$ uvx ruff check example example/foo.py
I002 [*] Missing required import: `from __future__ import annotations`
--> /path/to/example/foo.py:1:1
help: Insert required import: `from __future__ import annotations`
I002 [*] Missing required import: `from __future__ import annotations`
--> /path/to/example/foo.py:1:1
help: Insert required import: `from __future__ import annotations`
Found 2 errors.
[*] 2 fixable with the `--fix` option.
```