`Path::components` strip `.` under the hood

[hyf0]

This behavior is part of spec.

rust-lang/rust#23229

This makes the following code

sugar_path/src/utils.rs

Lines 29 to 31 in 41fce88

	Component::CurDir => {
	has_resolved_dots = true;
	}

unreliable for detecting whether the dots are resolved.

[hyf0]

I'm going to keep this issue open. The issue block sugar_path to implementing on-demand normalization.

sugar_path/src/sugar_path.rs

Line 18 in 41fce88

/// If there's no normalization to be done, this function will return the original `Path`.

I saw how path-absolutize handles this, and I am not going to use it.

https://github.com/magiclen/path-absolutize/blob/c2966357fced68b60852333a6c0ca01250925b22/src/unix.rs#L63-L66

https://github.com/magiclen/path-absolutize/blob/c2966357fced68b60852333a6c0ca01250925b22/src/unix.rs#L86-L88

To summarize, I would remove the current on-demand normalization feature, which cause some bugs. But the return type would still be Cow in case of reducing future changes.