[PyX-user] Bug(?) in text placement using LaTeX

[Thomas B. <tho...@ho...>]

I've used PyX happily for years, but I've recently noticed what seems to be
a bug in text placement when using LaTeX for text processing. Here's my
code:

import pyx
pyx.text.set(engine = pyx.text.TexEngine)
c = pyx.canvas.canvas()
c.text(0, 0, 'A')
c.text(0, 0, 'B')
c.writePDFfile('out.pdf')

This produces the file attached as out_tex.pdf, with the A and B
superimposed as I'd expect. However, if I change the engine specified in
line 2 to pyx.text.LatexEngine then

   1. I see the warning *ignoring special 'header=l3backend-dvips.pro
   <http://l3backend-dvips.pro>'*
   2. The script produces the file attached as out_latex.pdf, with the A
   displaced downwards (and hence almost off the page).

I'm using PyX 0.15, Python 3.9.5, TeX = TeX 3.14159265 (TeX Live
2020/Debian) and LaTeX = pdfTeX 3.14159265-2.6-1.40.21 (TeX Live
2020/Debian), all running under Ubuntu 21.04. I believe that this issue
appeared when I upgraded to Ubuntu 21.04, which may also have involved
upgrades to some of these packages.

Can anyone suggest what I can do to prevent this displacement of the text
when using the LaTeX engine, please? Is this displacement related to the
warning? Any advice welcomed,

Thomas