percent in ProgressStyle template starts from 100% instead of 0%

[devmatteini]

Hi and thank you for maintaining this awesome crate!

After upgrading from 0.16.2 to 0.17.x I noticed that my spinner percent was always starting from 100% instead of 0%.

indicatif-percent-problems.webm

(I'm not sure if this is a related problem, but also the eta stopped working and always displays 0).

I created a simple repo to reproduce the issue: https://github.com/devmatteini/indicatif-percent-problems

Let me know if I can help somehow 😄

---

OS: Ubuntu 22.04
Rust: 1.63.0

[devmatteini]

I did a git bisect and found the bad commit: b138fef

Looking at the diff, I found the problem here at line 223:

indicatif/src/state.rs

Lines 220 to 229 in b138fef

	pub fn fraction(&self) -> f32 {
	let pos = self.pos.pos.load(Ordering::Relaxed);
	let pct = match (pos, self.len) {
	(_, None) => 1.0,
	(_, Some(0)) => 1.0,
	(0, _) => 0.0,
	(pos, Some(len)) => pos as f32 / len as f32,
	};
	pct.max(0.0).min(1.0)
	}

If self.len is None the percent is set to 1.0 which means is full.

If there is no length (None), shouldn't we treat it as 0%?