In the meantime things have evolved, Sphinx has changed its way to deal with this; see <https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=872944#74>
Thus, the current developers-reference built on a bookworm or later system leads to a output, where the search is working. Can be viewed at <https://people.debian.org/~holgerw/sphinx-theme-for-debian/alabaster/developers-reference/> (also with a different html theme, BTW) So, when wolkenstein gets updates to bookworm (currently on bullseye) it will just, I guess. Holger -- Sent from /e/ OS on Fairphone3