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\balloonGrobText for ledger lines

From: Werner LEMBERG
Subject: \balloonGrobText for ledger lines
Date: Sat, 14 Apr 2018 22:49:14 +0200 (CEST)

[lilypond be08490329a22423bb2a723eea7a5cd33f3a42d8]

I was just about asking on the user list how to get a balloon text for
a ledger line (apparently, it's not possible); while preparing a MWE I
found out that the following crashes lilypond:

  \new Staff \with {
    \consists "Balloon_engraver"
  } {
    \balloonGrobText #'LedgerLineSpanner #'(1 . 0.5)
      \markup "ledger line"

gdb reports

  #0  0x000000000041e9b6 in Paper_column::get_rank() const (this=0x0) at 
  #1  0x0000000000589f51 in Item::spanned_rank_interval() const 
(this=0x1026a90) at item.cc:191
  #2  0x000000000042af1c in Grob::less(Grob*, Grob*) (g1=0x1026a90, 
g2=0x10264b0) at grob.cc:537

as the top stack entries.


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