<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div>On 27 Apr 2008, at 10:14 am, VAFA KHALIGHI wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div>If You use MiKTeX (updated at 2008-02-26) and you typeset persian or arabic where you need to have ZERO WIDTH NON-JOINER between some words, it does the job well. But if you update MiKTeX (let's say today) and do the same as before it makes a gray like vertical line between the words that you used to have ZERO WIDTH NON-JIONER between them. I actually have put an example on the web and you can get it from</div> <div><a href="http://tex3.141592.googlepages.com/BeamerPersianPresentation.zip">http://tex3.141592.googlepages.com/BeamerPersianPresentation.zip</a></div> <div> </div> <div>I have done this by using the newly updated version of MiKTeX and when you look at the pdf file, you will observe the those gray vertical lines that I was talking about.</div> <div> </div> <div>So is this a XeTeX bug or a MiKTeX bug?</div> <div> </div></blockquote><br></div><div>The line you are seeing is the glyph provided for U+200C (zero width non-joiner) in the Roya font. In earlier versions of the ICU layout library, these glyphs were filtered out and never displayed, but as a result of some changes in v3.8 they now remain in the text, and so if the font has a visible glyph rather than a zero-width, blank one, you see it on the page.</div><div><br class="webkit-block-placeholder"></div><div><a href="http://bugs.icu-project.org/trac/ticket/6023">http://bugs.icu-project.org/trac/ticket/6023</a> shows that this is considered an ICU layout bug, and the behavior has been changed again. I have just applied the patch from that ticket to the xetex repository, so when MikTeX (or other distributions) is updated to v.0.998.1, the problem should go away.</div><div><br class="webkit-block-placeholder"></div><div>One possible solution in the meantime is to implement ZWNJ at the macro level; a simple version might be</div><div><br class="webkit-block-placeholder"></div><div> \catcode"200C=\active</div><div> \def^^^^200c{\hskip0pt\relax}</div><div><br class="webkit-block-placeholder"></div><div>though if you need it to be "robust" in LaTeX terms, a bit more care may be needed.</div><div><br class="webkit-block-placeholder"></div><div>JK</div><div><br class="webkit-block-placeholder"></div></body></html>