bug#44597: 26.3; bibtex should allow reverse sorting

[Lars Ingebrigtsen]

Francesco Potortì <pot@gnu.org> writes:

> I wish bibtex mode would allow for reverse sorting of entries.
>
> Some years ago I used to obtain that behaviour by advising the sort-subr
> functions when called inside a bibtex-mode buffer.  No more.
>
> The modern bibtex.el sorts an entry when bibtex-clean-entry is called
> when bibtex-maintain-sorted-entries is t without calling sort-subr, but
> relying only on bibtex-lessp, which is not easy to advice.

I haven't looked at the code closely, but wouldn't advising bibtex-lessp
to just swap the parameters work?

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