Re: [Lilypond-auto] Issue 4083 in lilypond: \keepWithTag does not nest well

[lilypond]

Comment #13 on issue 4083 by address@hidden: \keepWithTag does not  
nest well
https://code.google.com/p/lilypond/issues/detail?id=4083

<http://lsr.di.unimi.it/LSR/Item?id=871> has a few functions to solve this  
problem.
I attached a \chooseWithTag above because that function was not already in  
the LSR (and already I wish I had written \chooseWithTag to keep untagged  
material).

One of the functions (if generalized to work with a list of tags) is  
similar to (a)
  \cleansedKeepOrRemoveWithTag tags tagLayer music
"keep the music with a tag in 'tags' or without any tag among 'tagLayer',  
and remove the tags themselves in 'tagLayer' from the result; thus 'tags'  
can be included in 'tagLayer' to keep its music, but clean the tags so the  
music is not caught by other filters."

Instead of a global registry of tagLayers, we need to explicitly list  
tagLayer on every use of \cleansedKeepOrRemoveWithTag  that we want to  
restrict.  That repeating, however, does not seem to be a problem in  
practice.  Cleaning up after ourselves lets other uses of \keepWithTag  
remain innocent of whatever new tags we define.

A new function similar to (maybe simplified) \cleansedKeepOrRemoveWithTag,  
while keeping the old \keepWithTag, seems wise.

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