regtest not catched by make check

[Thomas Morley]

Hi,

it would be nice to have a regression test for
https://gitlab.com/lilypond/lilypond/-/merge_requests/497

I think I found some way to display differently with and without the
fix. See the attached file.

Though, I can't convince 'make check' to catch the difference.

Currently I'm at a loss. Any hints?

Thanks,
  Harm

fret-diagrams-dot-color.ly
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