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class MarginItemDecoration(private val spaceHeight: Int) : RecyclerView.ItemDecoration() {
    override fun getItemOffsets(outRect: Rect, view: View, 
        parent: RecyclerView, state: RecyclerView.State) {
        with(outRect) {
            if (parent.getChildAdapterPosition(view) == 0) {
                top = spaceHeight
            }
            left =  spaceHeight
            right = spaceHeight
            bottom = spaceHeight
        }
    }
}