active : and other shorthands in \label

[davidcarlisle]

https://tex.stackexchange.com/questions/511030/another-babel-french-incompatibility-with-crossreftools/512104#512104

shows that some uses of active shorthand characters, notably french : fail in \label. I suggest there adding another test to \active@prefix to test \ifincsname and use \string in that case.

That would be consistent with the \ifcsname test added to the UTF-8 handling to make non ascii characters safe in labels and filenames in the last release, so would fit well here I think.

[jbezos]

Yes, indeed. Already done here (commit 1d1c180 ). I'll upload it to CTAN very likely tomorrow.