2.4beta1 no math preview

[Neal Becker]

I'm testing 2.4beta1 fedora 37 from name=Copr repo for lyx-devel owned by
jamatos.

In 2.4beta1 choosing tools/preferences/look+feel/display/instant-preview
(on) doesn't seem to do anything.

I should add that in 2.3.6 I never got math preview to work either, but it
has a different problem.  Math previews appear, but use absurd amounts of
whitespace around them.  I did check pdfcrop was found by configure.log,
guessing that maybe that was needed.
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