Comment #19 on issue 4083 by tdanielsmusic: \keepWithTag does not nest well
https://code.google.com/p/lilypond/issues/detail?id=4083
From #14:
After mulling this over and figuring out that declaring a \tagGroup
will not just keep \keepWithTag of some package unaffected by any tags
otherwise in use but will _also_ hide the use of tags internal to the
package from any outside use of \keepWithTag,
That's the main advantage to my mind.
I decided to go forward on this approach.
Good.
However, the functionality of \keepWithTag #'(fromgroupI fromgroupII)
cannot easily be provided by anything else.
That's easy to understand, clear and does exactly what is expected.
Trevor
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