Tagging of section numbers

[u-fischer]

• Fix issue latex3/tagging-project#787
• Change the tagging of section numbers to section-number role-mapped to Span as this gives a better reading experience:

Internal housekeeping

• Ready to merge

Checklist of required changes before merge will be approved

• Test file(s) added (updated)
• Version and date string updated in changed source files
• Relevant \changes entries in source included
• Relevant changes.txt updated
• Rollback provided (if necessary)?
• ltnewsX.tex (and/or latexchanges.tex) updated

[davidcarlisle]

yes this gives a much better reading.
With Lbl, section headings are announced twice: a heading like "2 Introduction" read as "section heading level 1, 2; section heading level 1, introduction".
With Span it is read as "section heading level 1, 2 introduction"

[FrankMittelbach]

approved with some queries and some textual suggestions

[FrankMittelbach]

Just a thought: I don't know how long this no case change list already is, but wouldn't it be faster (and perhaps even better readable, if there is a general purpose \donotchangecase{...} with one argument that is used around material that should not change case?

[josephwright]

Do you mean \NoCaseChange?

[u-fischer]

I could instead put everywhere \NoCaseChange around the command if that is is faster, not sure.

[davidcarlisle]

it probably is faster as it has no effect on MakeUppercase in general whereas adding to the list means that every use of MakeUppercase has to check for \@hyp@section@target@n

[josephwright]

If we need more speed, I an always rework how \AddToNoCaseChangeList works

[FrankMittelbach]

Yes I meant that, I wasn't sure that surived in the final implementation. My guess is that it would be faster and and also clearer codewise. what's your option @josephwright ?

[FrankMittelbach]

If we need more speed, I an always rework how \AddToNoCaseChangeList works

maybe, but I don't see that it helps to have a long list if the task is always identical and understandably covered by a single command

[u-fischer]

I switched to NoCaseChange