2, 11 regression: Adding a spanner-engraver twice adds dual spanners

[Rune Zedeler]

\version "2.10.25"
\paper{ ragged-right=##t }
\new Voice \with { \consists Ottava_spanner_engraver \consists 
Ottava_spanner_engraver }
{
  b b b #(set-octavation 1) b b b b b b b #(set-octavation 0) b b b
}

<<inline: spanner_2_11_35.png>><<inline: spanner_2_10_33.png>>_______________________________________________
bug-lilypond mailing list
bug-lilypond@gnu.org
http://lists.gnu.org/mailman/listinfo/bug-lilypond