[Lilypond-auto] Issue 4423 in lilypond: Part_combine_iterator: eliminate array of context handles

[lilypond]

Status: Accepted
Owner: ----
Labels: Type-Enhancement Patch-new

New issue 4423 by address@hidden: Part_combine_iterator: eliminate array  
of context handles
https://code.google.com/p/lilypond/issues/detail?id=4423

This review covers multiple commits.

[1] Part_combine_iterator: move mmrest killing after child iteration Also  
limit mmrest killing to contexts that have just changed from being used to  
being unused.

[2] Part_combine_iterator: create child iterators in parent context Add an  
initial split state to ensure that the first split-list entry, whatever it  
is, will redirect the outlets for the child iterators.

[3] Part_combine_iterator: use NullVoice instead of Devnull This makes all  
outlets a kind of Voice.

[4] Part_combine_iterator: eliminate array of context handles The  
Part_combine_iterator no longer creates or keeps alive the Voice contexts  
that it uses. make-directed-part-combine-music does it. When the  
Part_combine_iterator needs to redirect a child iterator, it finds the new  
Voice by name among the siblings of the current Voice.



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