Add Ord/PartialOrd/Hash/Eq derives to generated enums in rust side

[qarmin]

Feature Description

Using

export enum CurrentTab {

generates this rust code

# [derive (Default , Copy , Clone , PartialEq , Debug)] pub enum r#CurrentTab {

I want to use CurrentTab in BTreeMap/HashMap as key, but currently I cannot do this, due missing traits, so I must manually implement them

impl Hash for CurrentTab {
    fn hash<H: Hasher>(&self, state: &mut H) {
        (*self as u8).hash(state);
    }
}
impl Eq for CurrentTab {}

Can this derives be added by default?

Product Impact

No response

[tronical]

I suppose adding them now would break existing code. But what you can do is to use @rust-attr(derive(Ord)) etc to let the compiler generate them. See the bottom of https://docs.slint.dev/latest/docs/rust/slint/docs/type_mappings/ for an example (with Serde).

[ogoffart]

This would be a breaking change if one already has implement it manually.
But we probably should add them if we go for a Slint 2.0 or some kind of edition system.