[luatex] LuaTeX crashes

Taco Hoekwater taco at elvenkind.com
Thu Jul 14 07:48:47 CEST 2011

Hi Khaled,

On 07/12/11 22:20, Khaled Hosny wrote:
> It does not crash luatex, but I get no bidi at all too.

Disappointing, but not too surprising.

> After some debugging, this unset box thing happens with groupcode
> "fin_row" in pre_linebreak_filter, with some grepping through code I see
> that "fin_row" contains unset boxes separated by glue at the end of raw
> in [h|v]align (whatever that means, I've absolutely no idea). 

Every cell in a \halign row becomes and unset box, and these are
separated from each other by a glue object that matches \tabskip.

Subsequent processing depends on this structure remaining intact,
but you should be able to get bidi by adjusting the contents of
the unset boxes (assuming skipping them does not work, I have not
really tested that).

Best wishes,

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