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

Taco Hoekwater taco at elvenkind.com
Tue Apr 6 14:30:57 CEST 2010

Vafa Khalighi wrote:
> The attached (test.tex, test-pdftex.pdf and test-luatex.pdf) shows that this
> primitive actually works in PDFTeX and XeTeX but it does not in luatex (it
> is defined, but does not work).
> This is a very useful primitive for bidirectional typesetting. However,
> there is a bug that Jonathan mentioned on the xetex mailing list and that is
> about spacing (look at direction.tex and direction.pdf).
> I suggest to not remove this primitive from luatex since it is essential for
> bidirectional typesetting, and I already emailed Peter, so if he fixes the
> bug, then no problem but if he does not, would you Taco be able to fix this
> please?

Can you explain the offered functionality? That is not clear to me from
the example code.

Best wishes,

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