Issue 414 in lilypond: Hairpin through piano staff change cases explosions

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Issue 414: Hairpin through piano staff change cases explosions
http://code.google.com/p/lilypond/issues/detail?id=414

New issue report by trevorbaca:
The following snippet explodes because of the hairpin at line 7:


%%% EX 1 %%%

\version "2.11.28"

\new PianoStaff <<
   \new Staff = pianoone {
      \time 3/4
      c'''16 \mp
      \<
      c'''16
      c'''16
      r16
      \change Staff = pianotwo
      c16
      c16
      c16
      r16
      \change Staff = pianoone
      c'''16
      c'''16
      c'''16  \mf
      r16
   }
   \new Staff = pianotwo {
      \clef bass
      \time 3/4
      s2.
   }
>>

%%% END EX 1 %%%


GNU LilyPond 2.11.28
Processing `0165.ly'
Parsing...
Interpreting music... 
Preprocessing graphical objects...ERROR: In procedure
ly:hara-kiri-group-spanner::pure-height:
ERROR: Wrong type argument in position 2: 0
rm: 0165.ps: No such file or directory


Commenting out the hairpin \< at line 7 produces the otherwise correct
output attached here.




Attachments:
        hairpin-explosions.png  10.0 KB 


Issue attributes:
        Status: New
        Owner: ----
        Labels: Type-Defect Priority-Medium

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