[XeTeX] additional beginL endL nodes in math

Khaled Hosny khaledhosny at eglug.org
Wed Apr 15 21:05:18 CEST 2015

On Wed, Apr 15, 2015 at 04:29:47PM +0100, David Carlisle wrote:
> Is there no other way that the issues you have could be addressed
> without introducing TeX-XeT?

I first reported this issue in 2008, 7 years ago, so it seems it is not
going to go way magically, much to my surprise. Peter Breitenlohner
became aware of this issue 2 years ago and a fix were promised but
nothing so far (not that I blame him).

> The more we look at this the more it seems a very unfortunate step,
> introducing several incompatibilities
> with pdftex and luatex.

That is unfortunate.

> Especially if there is a possibility of moving in the end to an
> Omega/luatex model for bidirectional support
> introducing a change at this point seems a strange choice.

AFAICS, a port from Omega model is unlikely to happen, it is a big
invasive change and is as untested as the TeX-XeT model and has its own
share of problems, and, more importantly, no one seems to be stepping up
to do the required work.

> The extra nodes added here really are a backward step, my first
> suggestion of only conditionally
> adding them doesn't really work if boxes containing math are saved and
> used in different contexts.

I fail to see that catastrophe this is causing.

> Especially now in the Texlive 2015 pretest period there is so little
> time to test any
> changes.
> Would it be possible to back it out this change at least until after
> TL2015 is released
> That would give time to investigate a more compatible way to address the issues?

This was backed out for 2014 release, if I’m going to back it out for
each release why bother with it at all?


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