Issue 526 in lilypond: multiple engravers produce multiple output

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Issue 526: multiple engravers produce multiple output
http://code.google.com/p/lilypond/issues/detail?id=526

New issue report by gpermus:
Between 2.11.33 and 2.11.35, we started producing output for multiple
(identical) engravers.

- if this was accidental, then it should obviously be fixed.
- if this was deliberate, then in this case somebody should go through
engraver-init.ly to ensure that no engravers are added twice anywhere.
E.g. the DrumVoice is in trouble because it contains some dual engravers
(clones of the engravers already added at Voice context)

Currently at DrumStaves, all text scripts are added twice upon each other.



Issue attributes:
        Status: Accepted
        Owner: gpermus
        Labels: Type-Defect Priority-Regression

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