Get the first position of a Composable.

FirstPlacement.kt

@Composable
fun Modifier.onFirstPlacement(onFirstPlacement: (LayoutCoordinates) -> Unit): Modifier {
    var isFirstPlacement by remember { mutableStateOf(true) }
    var currentPosition by remember { mutableStateOf(Offset.Zero) }

    return onPlaced {
        if (isFirstPlacement) {
            onFirstPlacement(it)
            if (currentPosition == it.positionInWindow()) {
                isFirstPlacement = false
            } else {
                currentPosition = it.positionInWindow()
            }
        }
    }
}