\lxSVG@closescope leaks into reversion, breaks --pictureimages

[xworld21]

As per subject: very simple TikZ figures will break --pictureimages because \lxSVG@closescope does not disappear from the reversion. I am not planning to use --pictureimages, I am just trying to understand how pgfsys-latexml.def is supposed to be written. I gather that the intention is for the @tex tag to rebuild an equivalent output.

[dginev]

This issue reminds me that we had an internal discussion in the past that the reversions we get for pgf figures can be a bit too low-level. The context back then was that when texlive versions change, the reverted attributes have unpredictable diffs (due to internal library code getting refactored) even if the outer pgf/tikz figure remains the same. Which makes it hard to test such figures in CI, as they would need a different test target for each texlive.

All that to say, maybe we would benefit from having a higher-level reversion for pgf/tikz figures, that is collected before any/most expansion takes place.