U+200B and LaTeX

[nopria <mmj529-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Converting from docbook to LaTeX I came across a possible uncorrect 
management of U+200B when converting to LaTeX.
The following docbook MWE (the simple string "...abc")

<?xml version="1.0" encoding="UTF-8"?>
<?asciidoc-toc?>
<?asciidoc-numbered?>
<article xmlns="http://docbook.org/ns/docbook" xmlns:xl=
"http://www.w3.org/1999/xlink" version="5.0" xml:lang="en">
<simpara>&#8230;&#8203;abc</simpara>

is converted to LaTeX

\ldots​abc

with a (invisible but detectable in the real output) zero-width-space 
between "\ldots" and "abc".

I think that the correct LaTeX output should be

\ldots abc

with a standard space after `\ldots`, because if you try to produce a PDF 
you get

[WARNING] Missing character: There is no ÔÇï (U+200B) in font [lmroman10-
regular]:mapping=tex-text;!

because of the presence of the zero-width-space, whereas with the standard 
space you get the correct output ("...abc" and not "... abc") in PDF (and 
no warnings).

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