bug#52354: 27.2; bibtex-sort-buffers fails at least for types @PhdThesis and @TechReport

[Lars Ingebrigtsen <larsi@gnus.org>]

Dominik Schrempf <dominik.schrempf@gmail.com> writes:

> When using `bibtex-sort-buffers' on a BibTeX file with BibLaTeX dialect,
> items of type @PhdThesis and @TechReport (but probably other types too)
> are not sorted correctly.
>
> For example, the following order is not changed when executing the
> mentioned function:
>
> @Article{Shaw2013, ...}
> @PhdThesis{Siren2012, ...}
> @Article{Shih2013, ...}

Trying to sort that with `bibtex-sort-buffers' doesn't seem to do
anything, with or without the @PhdThesis entry?

Do you have a complete recipe for reproducing the problem, starting from
"emacs -Q"?  (And a complete test file would be helpful, too.)

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