Error messages

[Kornel Benko]

Am Mon, 6 Mar 2023 13:54:22 +0100
schrieb Pavel Sanda <sanda at lyx.org>:

> On Mon, Mar 06, 2023 at 11:38:22AM +0100, Pavel Sanda wrote:
> > On Wed, Feb 22, 2023 at 10:52:14AM +0100, Jean-Pierre Chrétien wrote:  
> > > Dear developers
> > > 
> > > When I open the original UserGuide with 2.4.0dev, I see this in the calling
> > > command window:
> > > 
> > > Warning: dvipng failed to generate images from lyxpreviewOuMJqr.dvi...
> > > fallback to legacy method
> > > Warning: epstopdf failed on page 1, file lyxpreviewOuMJqr.001
> > > Warning: epstopdf failed on page 2, file lyxpreviewOuMJqr.002
> > > [...] snip
> > > Warning: epstopdf failed on page 109, file lyxpreviewOuMJqr.109
> > > Warning: epstopdf failed on page 110, file lyxpreviewOuMJqr.110
> > > Warning: Now trying to obtain failed previews through pdflatex
> > > Warning: Failed to produce 1 preview snippet(s)
> > > 
> > > When I open the French version, I get only the last line.
> > > 
> > > Any clue ?  
> > 
> > Ghostscript chokes on our dvi.
> > If passed debug option to it via e.g. epstopdf --debug --gsopt=-dDEBUG
> > lyxpreviewjGIxTU.ps one gets:
> > Error: /typecheck in --div--
> > 
> > It seems related to hyperref, this page wrt preview+hyperref seems related
> > https://github.com/latex3/hyperref/issues/213
> > https://lists.gnu.org/archive/html/bug-auctex/2020-11/msg00000.html
> > 
> > I have no clue what 'latex shipout code' is and did not inspect further.  
> 
> Apart from trying to figure out what's wrong with latex-preview I looked at
> our sources and figured out that
> 1) although we see this error on console, the preview is still produced
>    OK via backup pdf route
> 2) this issue is not new to 2.4. It is present in 2.3 as well - the only difference
>    triggering this problem in UG is:
> 
> -\default_output_format pdf2
> +\default_output_format default
>    
>    which was changed during 2.4 lifetime.
> 
> Given that the underlying problem is likely in latex-preview whose
> maintainer is not interested in fixing (probably this) problem I would
> leave the issue dormant.
> 
> Pavel

Or using the attached for preview.
(Using this without problems for some time now)

	Kornel
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