Issue 754 in lilypond: \transpose should not affect \transposition

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Comment #2 on issue 754 by n.puttock: \transpose should not affect  
\transposition
http://code.google.com/p/lilypond/issues/detail?id=754

I was going to suggest a property which can mark music as untransposable,  
but a quick
check confirms that it already exists.  Unfortunately it doesn't work with
\transposition.

Using the test file and \withMusicProperty for convenience, it's easy to  
prevent the
individual notes in each stave from being transposed, but it seems the  
pitch passed
to \transposition has already been transposed by the time untransposable is  
set:

\score {
 \transpose c d {
 \new StaffGroup <<
   \new Staff {
     \key c \major
     % this works
     \withMusicProperty #'untransposable ##t c'1
   }
   \new Staff {
     % this fails
     \transposition \withMusicProperty #'untransposable ##t bes
     \key d \major
     d'1
   }
 >>
 }
 \layout {}
 \midi {}  % Should be a unison D, but is not
}

Having checked the music function for \transposition, it's clear that  
untransposable
= ##t for the note, but it seems to be to late to have any effect.

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