Export to lyxhtml broken

[Scott Kostyshak]

On Sat, Sep 19, 2020 at 07:09:55PM -0400, Scott Kostyshak wrote:
> On Sun, Sep 20, 2020 at 12:08:55AM +0200, Kornel Benko wrote:
> > 
> > Unfortunately the tests do not try to display the resulting
> > xhtml code, they only check with xmllint.
> > 
> > ATM, most (if not all) xhtml exports create invalid output in the sense
> > that the output is not displayable with firefox.
> > 
> > (This works with lyx2.3)
> 
> I can reproduce. For example, with the English "Welcome.lyx" file, I get the following error when viewing in Chromium:
> 
>   error on line 47 at column 152: Entity 'rArr' not defined
> 
> The export of the 2.3.x analog seems to works fine.

We might need to tweak our xmllint flags? Running with no flags does seem to catch this error:

$ xmllint Welcome.xhtml
Welcome.xhtml:47: parser error : Entity 'rArr' not defined
ase use it! Start with the menu <span style='font-family:sans-serif;'>Help⇒
...

Scott
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