ctests for French User Guide are failing

[JP]

Le 30 mai 2021 19:20:39 Scott Kostyshak <skostysh at lyx.org> a écrit :

> On Sun, May 30, 2021 at 03:30:31PM +0200, Jean-Pierre Chrétien wrote:
>> Le 28/05/2021 à 14:24, Scott Kostyshak a écrit :
>> > On Fri, May 28, 2021 at 08:51:08AM +0200, Jean-Pierre Chrétien wrote:
>> > > Le 28/05/2021 à 02:14, Scott Kostyshak a écrit :
>> > > > The following ctests for the French User Guide on current master are 
>> failing for me:
>> > > >
>> > > >     export/doc/fr/UserGuide_lyx22 (Failed)
>> > > >     export/doc/fr/UserGuide_lyx23 (Failed)
>> > > >     export/doc/fr/UserGuide_dvi (Failed)
>> > > >     export/doc/fr/UserGuide_dvi3_texF (Failed)
>> > > >     export/doc/fr/UserGuide_pdf (Failed)
>> > > >     DEFAULTOUTPUT_export/doc/fr/UserGuide_pdf2 (Failed)
>> > > >     export/doc/fr/UserGuide_pdf3 (Failed)
>> > > >     export/doc/fr/UserGuide_pdf5_texF (Failed)
>> > >
>> > > Should be fixed now.
>> >
>> > Works well. Thanks for the quick fix, Jean-Pierre!
>> 
>> The error that made the tests fail is quite peculiar. I copied the new
>> escape sequences at the end of section 6.8.1 from the English UserGuide
>> without marking it as French, and I got this error:
>> 
>> ! Paragraph ended before \bbl at foreign@x was complete.
>> 
>> When I look at the code, I do not see any missing parenthesis.
>> 
>> eux\foreignlanguage{english}{.\nomenclature{%@, %|, %!, %"}{The quote sign
>> in TeX code is output by writing ' %"{}%"{} '.}}
>> 
>> The error disappears when I mark the index entry as French, and the new 
>> code is:
>> 
>> .\nomenclature{%@, %|, %!, %"}{The quote sign in TeX code is output by
>> writing ' %"{}%"{} '.}
>> 
>> Could this be a hidden bug affecting language embedding of index entries?
>> I'll try to build a MWE.
>
> Thanks for looking into it. I do not know LaTeX well, but I agree with
> you that I do not see any missing parenthesis. I wonder if this could be
> a bug in a LaTeX package (either nomenclature or the language handling).
>

Thé problem comes from the % signs  in the arguments of the nomenclature 
command, seems that they are not escaped in the range of the 
\foreignlanguage command.
The LaTeX snippet works fine or I replace foreignlanguage by selectlanguage.
How does LyX To decide between these two forms of language switching?

-- 
Jean-Pierre