Am 02.12.2021 um 14:14 schrieb Juan Manuel Macías:
> Ihor Radchenko writes:
>
>> Denis Maier<denismaier@mailbox.org>  writes:
>>
>>>> Can you create an example of such scenario and post it as a bug?
>>>> Probably, we just need to strip all zero-width spaces at the basic ox.el
>>>> level.
>>> To be clear: That's not an org bug. It's just that latex won't be able
>>> such a word. If | is a zero width space, the word "hyphen|ation" is not
>>> the same as "hyphenation".
>>> 1. hyphenation
>>> 2. hyphen|ation
>> You are right for your example, but if we force the user to put
>> *hyphen*|ation to create bold emphasis, it should not be any different
>> compared to @@latex:\textbf{hyphen}ation@@. Meanwhile the*hyphen*|ation
>> gets exported as \textbf{hyphen}|ation keeping the zero width space.
> -- I would say that they are very random cases, and therefore 
> difficult to reproduce. In the 'hyphenation' example, if we load the 
> package showhypehns, you see that: /hyphen/​ation (with zero width sp) 
> and \emph{hyphen}ation they are cut in the same way. But differently 
> from hyphenation (without emphasis) (compiled with LuaTeX). Anyway, I 
> have come across some curious cases. For example, a long time ago I 
> had defined a macro for text in other languages: #+MACRO: lg (eval (if 
> (org-export-derived-backend-p org-export-current-backend 'latex) 
> (concat "@@latex:\\foreignlanguage{@@" $1 "@@latex:}{@@" "\u200B" $2 
> "\u200B" "@@latex:}@@") $2)) I needed to add before and after a zero 
> width space, but doing so, the shape of the text was altered. That can 
> be reproduced with this example: #+LaTeX_Header: 
> \usepackage{showhyphens} #+LaTeX_Header:\usepackage{lipsum,multicol} 
> #+LaTeX_Header:\usepackage[spanish]{babel} #+LaTeX_Header: 
> \def\example{\lipsum[1]} #+LaTeX_Header: \def\zwsp{\char"200B{}} 
> #+OPTIONS: toc:nil @@latex:\begin{multicols}{2}@@ 
> @@latex:\foreignlanguage{italian}{\zwsp\example\zwsp}@@ 
> @@latex:\foreignlanguage{italian}​{\example}@@ 
> @@latex:\end{multicols}@@ Best regards, Juan Manuel

Thanks Juan Manuel. I should have tried that first. Hyphenation is the 
same for both /hyphen/​ation (with zero width sp) and 
\emph{hyphen}ation. (Maybe I can nudge Hans Hagen to add some low level 
trickery in context that removes the groups before doing the 
hyphenation... but that's a different story.) Anyway, as Juan Manuel 
shows there can be cases where zero width spaces cause problems.

Denis