Dependency on the subfigure package

[Alex-Cremers]

It would be great to switch to subcaption, as subfigure hasn't been updated since 2005 and causes a lot of errors. Maybe making it an option for backward compatibility.

[fintelkai]

We'll look into it. I don't think we haven't seen errors in our S&P production work. Can you elaborate on the errors you're getting? Is subcaption a drop-in replacement?

[Alex-Cremers]

I don't think it's a drop-in replacement, as subfigure uses \subfigure{...} while subcaption uses \begin{subfigure}.... Another alternative then might be the subfig package, but I'm not familiar with it, so I can't guarantee it's a perfect fit.

The last error I encountered is the one described here, but I remember getting different errors when typesetting a paper for GlossaPX a year ago (Glossa uses a stylesheet derived from S&P; there was a project to write a specific stylesheet for GlossaPX, no idea how much progress has been done).

I wish I had the time to propose a solution instead of just complaining!

[rawlins]

It seems very reasonable to me to change this as it's very clearly marked as obsolete on https://ctan.org/pkg/subfigure?lang=en, and it's rarely used by semprag: I counted 6 papers in the production archive. However, of those 6, two are in active production right now and one is in the deep backlog. I don't think it's worth keeping backwards compatibility in general because it's so rarely used, but we should either hold off on a change until after those are out, or actively test it out (possibly Grusdt, Lassiter, and Franke would be a good place to test out this change -- Aloni is near done iirc).