Re: [Lilypond-auto] Issue 1846 in lilypond: Improves horizontal spacing of axis groups that SpanBar grobs traverse

[lilypond]

Comment #24 on issue 1846 by address@hidden: Improves horizontal spacing of  
axis groups that SpanBar grobs traverse
https://code.google.com/p/lilypond/issues/detail?id=1846

Comment #17:

The code touched in commit 70fd22c reads:

Grob *
Grob::get_vertical_axis_group (Grob *g)
{
  if (!g)
    return 0;
  if (!g->get_parent (Y_AXIS))
    return 0;
  if (Axis_group_interface::has_interface (g)
      && Align_interface::has_interface (g->get_parent (Y_AXIS)))
    return g;
  return get_vertical_axis_group (g->get_parent (Y_AXIS));

}

Is that correct?  Why does the parent need an Align_interface but the grob  
itself only an Axis_group_interface?  I don't claim to understand this  
code, but the name of the function is get_vertical_axis_group, so what's  
with the Align_interface?

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