In texmath.c we have in various places
eq_box = hpack(..., ..., ..., -1);
the -1 means no explicit direction is passed to the box construction,
so hpack is using the current value of \textdirection. Shouldn't \mathdirection
(math_direction_par) be used here?
This is also inconsistent with inline math, where \textdirection does not
influence
the visual result.
Example:
--------------------------
test
$$
a+b=c\textdirection=1
$$
$\textdirection=1 a+b=c$
\bye--------------------------
This is similar to the recent discussion about \vcenter, which also does not use
an explicit direction in its construction (there vpack use \bodydirection and
not \mathdirection).
Udi
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