#[inspectable(inner_attributes)] requires funky undocumented syntax

[Xion]

For InNewWindow<T> struct fields, the corresponding WindowAttributes declare an inner_attributes value that can be set to the attributes of T. However, there is no example for doing this when deriving Inspectable through the proc-macro (#[derive(Inspectable)]) which is an issue because it doesn't follow the conventional syntax.

Typically (c.f. popular crates like serde), when #[foo] attributes support nested values, they do so using a function-like syntax, e.g.:

#[serde(rename(serialize = "ser_name"))]

One would expect #[inspectable] to do likewise:

    #[inspectable(
        label = "Player",
        title = "Player", title_bar, resizable, scrollable,
        inner_attributes(despawnable = false),
    )]
    player: InNewWindow<InspectorQuerySingle<Entity, With<Player>>>,

Unfortunately, that's not supported. I did some digging into the proc-macro code for the attribute and found that the way to make it work is to explicitly create the value for inner_attributes and assign to it:

#[inspectable(/* ... */ inner_attributes = EntityAttributes{despawnable: false})]

This is quite unusual; normally, users don't have to explicitly provide values of the crate's own types when using a #[derive] macro.

I'd suggest providing an example of this atypical use of inner_attributes. or changing it to follow de-facto conventions of the Rust ecosystem.