Hi list,
I want to  simulate \hss  in lua end in ConTeXt/luametatex environment.
For example,

```ConTeXt
a{\raise 1.5ex\hbox to 0pt{\hss b}}c
```

should get 'b' on top of 'a', as follows:

```pdf
b
ac
```
and in lua, I see a <glue userskip> before "b" node, width
width:0, stretch:65536, shrink:65536, stretchorder:2, shrinkorder:2

And in lua, I do as follows(part of my app seen in attachment):

```lua
    local hss = node_new(glue_id)
    hss.stretch = 65536
    hss.stretchorder = 2
    hss.shrink = 65536
    hss.shrinkorder = 2
    hss.width = 0
    list,_ = node_insertbefore(list, list, hss)  -- b is in the list
    -- I got a <glue userskip> with
    width:0, stretch:65536, shrink:65536, stretchorder:2, shrinkorder:2

    local box = node_new(hlist_id, "box")
    box.head = list
    box.width = 0
    box.shift = -tex_sp("1ex")
    -- I got <hlist box>  width:0       height:0       deep:0
shift: -503424

    head, current = node_insertbefore(head,current, box)  -- current is 'c' node
```

And got 'b' on top of 'c' in pdf as follows:

```pdf
  b
ac
```

How can I get 'b' on top of 'a' as \hss do?

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