asymmetric spacing around \sideset about latex2e HOT 8 OPEN

looks like a clear bug to me that is worth fixing. Would it be advisable (to start) using latexrelease within the amsmath code to be able to do such fixes rather than introducing strange "options" to fix stuff?

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not sure why. If I have written a paper in 2017 assuming \sideset in its old definition and I reprocess it and it comes out wrongly I could add latexrelease from that date when I wrote the paper and that should result in using code as if it was 2017. Of course if there are other packages not using latexrelease and changing the formatting then it could still come out differently (but then due to those other package and it would come out differently regardless of \sideset fixed or not). Implementing fixes by providing options to revert has the problem that it is either adhoc or your essentially implement a "amsmathrelease" method. Why that should be better than simply using latexrelease is not clear to me.

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It depends... If for example you are using luatex and the latex kernel has changed to make it work in an updated luatex engine, then reverting all packages to an old state may not work at all. (In theory the kernel itself should be Ok as we don't mark such "forced" changes with latexrelease) but reverting the entire format (and any third party packages that are testing latexrelease) just to get the old behaviour for one construct seems a rather dangerous sledgehammer to be wielding.

Agreed it avoids a proliferation of ad hoc commands or options to revert specific changes but....

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from latex2e.

Unfortunately, the proposed fix doesn't really work in general. The logic under \sideset is weak to begin with.

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\[
\left|\sideset{}{^\text{quite very very very long}}\sum_{aaaaaaaaaaaaaaaaaa}\right|
\]
\end{document}

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This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

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This issue has been automatically marked as stale because it has not had recent activity.

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