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

Taco Hoekwater taco at elvenkind.com
Thu Apr 8 14:11:39 CEST 2010

Khaled Hosny wrote:
> May preference is to treat left and right as "start of the line" and
> "end of the line", so that existing macro code will give the logically
> expected result when one switches direction (one setting equation number
> to the right is actually expecting it at the start of the line). 

Ok, but that leaves the question whether \pardir or \mathdir decides
on start/end. Vafa clearly prefers \mathdir, but I am not so sure myself.

For Vafa to consider: \hangindent c.s. work on \pardir, and they cannot
take \mathdir into account because at the line breaking stage there is
no longer a math list, just a box.

Best wishes,

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