[v3] Incorrect spacing around super- and subscripts

[cebola2]

\subset seem to have lost spacing to its right in version 3.00.
An example is line 10 of
https://logrus.math.tecnico.ulisboa.pt/texto/3
Screenshot obtained from Firefox 69.0 on Linux

[zorkow]

I can confirm this. It seems to be related to the superscript.

A\subset\mathbb{R}

looks fine, while

A\subset\mathbb{R}^n

or

A\subset\mathbb{R}_n

does not.

[cebola2]

This seems to also affect \in and most likely other mathematical relations.
The existence of a font modifier such as \mathbb or \mathcal seems to be a requirement to trigger this.

[dpvc]

This turns out to be a bad default texClass for the base class used for superscripts and subscripts. It is set to TEXCLASS.NONE when it should be TEXCLASS.ORD, so the spacing is wrong. There effect only occurs when the base of the exponent is not just a simple symbol, but something like \mathbb{...} or even just {...}.

[dpvc]

I've made a PR that fixes the issue.