Re: Issue 1110 in lilypond: Wrong octave of repetition chord with \relative and #{ #} syntax

[lilypond]

Comment #8 on issue 1110 by address@hidden: Wrong octave of repetition chord  
with \relative and #{ #} syntax
http://code.google.com/p/lilypond/issues/detail?id=1110

This is not a problem of #{ ... #}.  It is actually a problem of $music.   
You'll get the same result if you say
zap = { <c e g>4 ~ q }
\relative c' \zap

The reason is that when music passes through a MUSIC_IDENTIFIER (and $  
works by creating such an identifier), Lilypond does a deep copy of the  
structure.

The repeated chord relative callback in lily/music-sequence.cc, however,  
works by looking up the pitch of the 'original-chord that it already  
assumes to be relativated.  Unfortunately, after a deep copy,  
the 'original-chord is no longer the same as the original chord, since the  
deep copying made _separate_ copies of the original chord, and the  
original-chord field of the RepeatedChord.

As a consequence, after copying the original-chord field does not point to  
a relativated chord, but to a copy that has been made _before_ relativizing  
and that is no longer associated with the relativized chord.