InstantPreview fails with Python 3.7.2 and I cannot figure out why. In
the console I see:

- graphics\PreviewLoader.cpp (781):
PreviewLoader::finishedInProgress(1): processing failed for python -tt
$$s/scripts/lyxpreview2bitmap.py --png
"C:/Users/User/AppData/Local/Temp/lyx_tmpdir.PlMVrEJL4248/lyx_tmpbuf0/lyxpreviewZb4248.tex"
--dpi 115 --fg 000000 --bg faf0e6 --bibtex="bibtex"

I tried to run the lyxpreview2bitmap.py manually in a console and then
get the error that it cannot find gswin32c or gswin64c. But the path to
it is correctly set in the LyX preferences.

I also could not find out how to tell the script a path to gswin32c.
Therefore I could not investigate further.
José, could you maybe have a look and tell me at least how to specify
the path to gswin32c when executing the script in a console?

thanks and regards
Uwe

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