PullToRefreshBox with ScrollArea is broken if the list it encapsulates fits on screen

[PLPeeters]

Hi! I just discovered another interaction edge case between ScrollArea and PullToRefreshBox.

In a nutshell, if the list fits on the screen, meaning there there is nothing to scroll, the pull-to-refresh animation cannot be triggered.

Here is a minimal reproduction, which is broken unless you initialise itemCount to any value that makes the list overflow the screen. Adding overscrollEffect = null to the ScrollArea also fixes the issue, but then we still lose the animation + it would require additional checks to know if we're overflowing, which isn't ideal.

@OptIn(ExperimentalMaterial3Api::class, ExperimentalFoundationApi::class)
@Preview
@Composable
fun Preview() {
    var itemCount by remember { mutableIntStateOf(5) } 
    var isRefreshing by remember { mutableStateOf(false) }
    val pullToRefreshState = rememberPullToRefreshState()
    val coroutineScope = rememberCoroutineScope()
    val onRefresh: () -> Unit = {
        isRefreshing = true
        coroutineScope.launch {
            delay(1500)
            itemCount += 5
            isRefreshing = false
        }
    }

    Scaffold {
        PullToRefreshBox(
            modifier = Modifier.padding(it).fillMaxSize(),
            state = pullToRefreshState,
            isRefreshing = isRefreshing,
            onRefresh = onRefresh,
        ) {
            val listState = rememberLazyListState()

            ScrollArea(
                state = rememberScrollAreaState(listState),
                overscrollEffectSides = listOf(OverscrollSides.Bottom),
            ) {
                LazyColumn(Modifier.fillMaxSize(), state = listState) {
                    items(itemCount) { ListItem({ Text(text = "Item ${itemCount - it}") }) }
                }
                VerticalScrollbar(
                    Modifier
                        .fillMaxHeight()
                        .align(Alignment.TopEnd)) {
                    Thumb(Modifier.background(Color.Red))
                }
            }
        }
    }
}