ChildItems support

[Skeptick]

No description provided.

[Skeptick]

I'm not sure about the naming. Open to suggestions.

[xxfast]

Hmm, we usually call this RoutedContent, maybe the same naming for this too?

[xxfast]

Nice addition 🙌 Sorry i've been ignoring these PRs for a year, my bad

One thing to sort before this can merge:

In items/Router.kt, items resolves its state in a getter:

val items: State<ChildItems<C, RouterContext>>
  get() = lazyItems.asState(lifecycle)

asState allocates a fresh mutableStateOf and adds a new subscribe(lifecycle) on every call, so each read (e.g. by router.items in RoutedItems, re-run on recomposition) re-subscribes and hands back a new State. The existing flavors (pages/slot/stack) call asState once in the factory and store the result as a val. Can you match that here, resolve once and hold it, instead of in the getter?

Separately, this branched off an older main: it'll need a rebase onto current (decompose is on 3.5.0 now, so the libs.versions.toml bump conflicts) and an apiDump for the new public API. Happy to help with that part if useful.

Actually i think i have push access to this branch so let me do that

[xxfast]

Looks good to me 👍