Bug: useSprings v9 fails to animate changing deps, report with a fix

[bebbi]

🐛 Bug Report

This sandbox should animate changed item heights every 2 seconds but it doesn't. A working fix is provided below.

To Reproduce

Check out sandbox, see how items stay static

Expected behavior

In the same sandbox, rename the useSprings hook call inside DraggableList to useSpringsFixed which is already imported.
--> Items now correctly change position every 2s.
The fix is based on a suggestion by @drcmda but my understanding is that v9 should correctly animate this without further code.

Link to repro (highly encouraged)

Sandbox above

Environment

• react-spring v9.0.0-beta.23

[aleclarson]

Here's the problem line:

const [springs, setSprings] = useSprings(items.length, fn(order, height), [items, height])

The fn function returns a function, which is only ever called once (on mount). We should probably change it to work with the deps argument.

I'll fix this when I get around to finishing and merging #670

[aleclarson]

This will be fixed by #808