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Just reading through the `AdapterList` PR, excited to see this start to take shape. I believe Flutter implements their lists on top of a fairly complex “sliver” API which they also use to implement things like fancy Material collapsing AppBars ala `CoordinatorLayout`. Does the Compose team have any thoughts about how to implement collapsing app bars with Compose?

(The AdapterList PR is here: <https://android-review.googlesource.com/c/platform/frameworks/support/+/1218839>)

A(n extremely) rough analog might be subcomposition, which the adapter list is using. Collapsing app bars probably won't need it, but it's there if there's a use case for it for whatever reason