👍 It didn’t occur to me to think of the old good bidi features of etex and I was just playing with \...dir’s. After some simple tests it seems to do the trick.
After some additional tests, setting \predisplaydirection=0 doesn’t seem the solution 🙁. Any additional suggestions on how to make luatex usable for serious math typesetting with RTL languages will be welcome. This includes the possibility of manipulations at the lua level (for example, I’m wondering if something similar to the macro \lastlinelength in sec. 7.7.2 can be used to catch and fix the spacing). I'm just looking for a solution. After tree weeks of fighting I’m somewhat desperate. Javier
