Previews and \jobname, was it a good idea?

[Jean-Marc Lasgouttes]

Dear all,

I ticket https://www.lyx.org/trac/ticket/9627, it was decided to define 
\jobname in preview file with the original file name.

However, run_command in lyxpreview_tools.py tries to read the aux file 
to determine whether it is necessary to run bibtex. It would be useful 
too to try to re-run latex until cross references are correct.

The result is clear: there is no bibtex preview in the attached example, 
but after reverting 1c94995a, it works again.

This prevents me from fixing the xref issues pointed by Enrico at #11535.

Ideas? One can always search for "\jobname" in the lyxpreview*.tex file 
and guess the aux file name, but this strikes as a bit hackish.

JMarc
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