To get more space between NoteColumn and DotColumn the following used
to work with 2.18.2

foo =
\override Score.DotColumn.before-line-breaking =
  #(lambda (dot-column)
    (ly:grob-set-property! dot-column 'positioning-done
      (lambda (grob)
        (ly:dot-column::calc-positioning-done grob)
        (ly:grob-translate-axis! grob 15 X))))


{
  \foo
  <gis' a' c''>4.
}

With a build from latest master I get:

lilypond: /home/hermann/lilypond-git/lily/grob-property.cc:242:
scm_unused_struct* Grob::try_callback_on_alist(scm_unused_struct**,
SCM, SCM): Assertion `scm_is_null (value) || scm_is_eq (value,
marker)' failed.
Aborted (core dumped)

A bug?
How to do it different?

Cheers,
  Harm

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