[luatex] \predisplaydirection from etex in luatex has no effect

[Taco Hoekwater]

Vafa Khalighi wrote:
> Ok, now I only need the exact meaning of the values.
> 
>>
> If you give value, say, 0 or a positive value, say 1, there is no difference
> (i.e. \eqno apears on RHS, and \leqno apears on LHS) but if you give a
> negative value, say -1, then \eqno will appear on LHS and \leqno will appear
> on RHS.
> 

Tracked at http://tracker.luatex.org/view.php?id=372