Fix checkbox labels becoming unclickable after first toggle

[ashishmohapatra240]

Fixes #3368

Checkbox labels could only be clicked once, then stopped working because CheckboxId::new() generated random IDs on every layout update. It updated CheckboxInput widgets with new IDs but skipped updating TextLabel widgets.

I added CheckboxId::from_string() to generate stable, hash-based IDs, so each checkbox/label pair now maintains consistent IDs across renders.

https://github.com/user-attachments/assets/00ee985a-00f2-4171-b898-a46c0c6048ad

[Keavon]

Thank you for your attempt, but this is not an appropriate solution. The regression needs to be fixed, not worked around by fundamentally changing its approach.

[TrueDoctor]

I did also think about hashing since the random id generation just isn't a a particularly sensible design. What we could do is that we do actually unse a content based hash, which includes its location in the widget tree. Then the ids would be stable which makes the diffing substantially easier and would remove some foot guns

[ashishmohapatra240]

Happy to implement either approach. Just let me know which direction you'd prefer!

[Keavon]

Let's please try to fix the regression for now before switching approaches quite yet.

[TrueDoctor]

I think trying to fix this in the old system would take more effort than implementing a proper fix which would be to not use random ids. The random ids did work fine before had diffing, but combining both is just a very fragile system which is prone to breaking. (And I think we should do this for all widget ids, not just the checkboxes)

[Keavon]

Ok, in that case, I suggest we move back to the issue instead of the PR to discuss those plans.

[ashishmohapatra240]

Sure @Keavon @TrueDoctor , let's move back to the issue. 😅