Yes. This overrides the default after-line-breaking
callback, which causes trouble if that callback was
supposed to do something important. Harm's code was
written at a time where the grob-transformer was
not available. It's now possible to write this code
in a way that works for grobs with an after-line-breaking
callback. See the attached file. I've also modified
it so that the URL to the documentation is computed
from the version number of the LilyPond version that
runs the file, and not hardcoded.