During my work on PR #22616, while trying to fix the
`test_reporting_fs_changes_to_language_servers` test case, I noticed
that we are currently handling paths using `String` in some places.
However, this approach causes issues on Windows.
This draft PR modifies `rebuild_watched_paths_inner` and
`glob_literal_prefix`. For example, take the `glob_literal_prefix`
function modified in this PR:
```rust
assert_eq!(
glob_literal_prefix("node_modules/**/*.js"),
"node_modules"
); // This works on Unix, fails on Windows
assert_eq!(
glob_literal_prefix("node_modules\\**\\*.js"),
"node_modules"
); // This works on Windows
assert_eq!(
glob_literal_prefix("node_modules\\**/*.js"),
"node_modules"
); // This fails on Windows
```
The current implementation treats path as `String` and relies on `\` as
the path separator on Windows, but on Windows, both `/` and `\` can be
used as separators. This means that `node_modules\**/*.js` is also a
valid path representation.
There are two potential solutions to this issue:
1. **Continue handling paths with `String`**, and on Windows, replace
all `/` with `\`.
2. **Use `Path` for path handling**, which is the solution implemented
in this PR.
### Advantages of Solution 1:
- Simple and direct.
### Advantages of Solution 2:
- More robust, especially in handling `strip_prefix`.
Currently, the logic for removing a path prefix looks like this:
```rust
let path = "/some/path/to/file.rs";
let parent = "/some/path/to";
// remove prefix
let file = path.strip_prefix(parent).unwrap(); // which is `/file.rs`
let file = file.strip_prefix("/").unwrap();
```
However, using `Path` simplifies this process and makes it more robust:
```rust
let path = Path::new("C:/path/to/src/main.rs");
let parent = Path::new("C:/path/to/src");
let file = path.strip_prefix(&parent).unwrap(); // which is `main.rs`
let path = Path::new("C:\\path\\to/src/main.rs");
let parent = Path::new("C:/path/to\\src\\");
let file = path.strip_prefix(&parent).unwrap(); // which is `main.rs`
```
Release Notes:
- N/A
---------
Co-authored-by: Kirill Bulatov <mail4score@gmail.com>
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