> > It is a side effect of what the the par builder considers to be valid > breakpoints. The current approach is playing very safe but after looking at > it Taco and I decided that it can be a more tolerant with respect to end > dirs so the next luatex version will have that. > > Anyway: You need to code carefully: the space after "TRT" in "\textdir TRT > x" is meaningful so in your example you introduce spaces. >
Thanks for the explanation. So the space after \textdir TLT is meaningful but the one after \lefttoright isn't. (I guess, I should have used \textdir TLT\relax. I'm going to use the high-level \lefttoright command from now on.) Also, in context don't use \textdir etc directly, just use \lefttoright and > \righttoleft in combination with \setupalign as I will not spend much time > on side effects of interfering with these low level dir changers directly. > Great! You partly answered another question I meant to ask: what is the proper way to write \textdir and \pardir in CONTEXT? So \lefttoright and \righttoleft are replacements for \textdir TLT and \textdir TRT. How should I code in \pardir TRT in CONTEXT? I couldn't find anything for that in spac-ali.mkiv. Those low-level LuaTeX directives were part of an attempt to come to the core of a problem I'd run into with numbers at the end of a right-to-left line. The BiDi algorithm correctly gave left-to-right direction to that digit sequence and the result was that the word following the number had gone into the margin. —MHB
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