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

[Vafa Khalighi]

Hi Taco

Thanks a lot for this fix.

The good news is that the bug that exist with pdftex and xetex, does not
exist with luatex.

The bad news is that, this fix introduces two new bugs shown in the
attached.

Thanks again

-- 
Best wishes,
Vafa Khalighi
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