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Rework superscript: latex-to-unicode and unicode-to-latex roundtrip not working #3644

@koppor

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@koppor

Bib entry:

@InProceedings{NvLKL2007,
  author    = {J{\"o}rg Nitzsche and Tammo van Lessen and Dimka Karastoyanova and Frank Leymann},
  title     = {{BPEL}\textsuperscript{light}},
  booktitle = {Proceedings 5\textsuperscript{th} International Conference on Business Process Management (BPM)},
}

latex to unicode:

@InProceedings{NvLKL2007,
  author    = {Jörg Nitzsche and Tammo van Lessen and Dimka Karastoyanova and Frank Leymann},
  title     = {BPELˡⁱᵍʰᵗ},
  booktitle = {Proceedings 5ᵗʰ International Conference on Business Process Management (BPM)},
}

We once had the discussion somewhere (I don't remember where), that Unicode superscripts should be used for math only. This is also stated there: https://en.wikipedia.org/wiki/Unicode_subscripts_and_superscripts

The issue with the current conversion is that unicode-to-latex does not revert that conversion:

@InProceedings{NvLKL2007,
  author    = {J{\"{o}}rg Nitzsche and Tammo van Lessen and Dimka Karastoyanova and Frank Leymann},
  title     = {BPELˡⁱᵍʰᵗ},
  booktitle = {Proceedings 5ᵗʰ International Conference on Business Process Management (BPM)},
}

I propose to NOT convert superscript to unicode at all in the latex-to-unicode converter. For the entry table, this conversion is fine with me as it improves the readability. Maybe, we have to parameterize our latex-to-unicode converter?

With this issue, I cannot recommend to use biblatex and our default conversion settings anymore as it is not possible to go back to bibtex for papers (Springer's LNCS, ...) anymore.

Refs #2601

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