Comment #19 on issue 3629 by [email protected]: Patch: Improvements to \offset
http://code.google.com/p/lilypond/issues/detail?id=3629
To answer my own question: ly:grob-chain-callback works on a live grob
rather than on the grob property templates stored as context properties.
So to use ly:grob-chain-callback, one would need to have a grob
acknowledger listen and apply operations to live grobs like the
Tweak_engraver does. And/or like \overrideProperty maybe.
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