[luatex] Bad skips with display math

[Javier Bezos]

Hans,

> \predisplaydirection=0 might help here (defaults to -1)

👍 It didn’t occur to me to think of the old good bidi features
of etex and I was just playing with \...dir’s. After some simple
tests it seems to do the trick.

> I'll look into it (in luatex maybe under some flag/mode control because we 
> are frozen).

Frozen— So I presume the following bug won’t get fixed and
we have to find some workaround? 😖

https://tug.org/pipermail/luatex/2019-April/007126.html

Javier