Am Montag, 19. September 2016 um 16:28:28, schrieb Scott Kostyshak 
<skost...@lyx.org>
> On Mon, Sep 19, 2016 at 08:20:35PM +0000, Guenter Milde wrote:
> > On 2016-09-19, Scott Kostyshak wrote:
> > 
> > > [-- Type: text/plain, Encoding: quoted-printable --]
> > 
> > > If I try to compile fr/beamer.lyx to PDF (XeTeX) (using the default TeX
> > > fonts) I get the following LyX error:
> > 
> > >   Could not find LaTeX command for character 'é'. It is suggested to
> > >   change the document encoding to utf8.
> > 
> > This is a very outdated suggestion (and should either be removed or 
> > updated).
> > 
> > In most cases, it only helps to change the encoding to utf8, if you also
> > define new Unicode character bindings in the user-preamble.
> > 
> > Furthermore, with XeTeX and 8-bit TeX fonts, the encoding is ascii - no
> > other encoding works with this combination!
> > 
> > Normally, the é is converted by lib/unicodesymbols to \'{e} and all is fine.
> > 
> > > This error is from a 'é' in a comment (in ERT):
> > > %Pour illustrer le différence entre decouvert et visible:
> > 
> > ERT is a special case - it is up to the user to ensure proper working.
> > 
> > > Should the encoding be change?
> > 
> > No.
> 
> OK thanks for the explanation.
> 
> > Alternatives:
> > 
> > * change the comment from ERT to comment
> 
> I did not think of this possibility. I like it.
> 
> > * invert the test (we already have several cases of inverted:ERT)
> 
> Indeed but this one seems easily avoidable (I have not checked the
> others).
> 
> Scott

I'd say, since it is ERT, which means 'latex', use the suggested  \'{e}.

        Kornel

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