Comment #12 on issue 4083 by [email protected]: \keepWithTag does not
nest well
https://code.google.com/p/lilypond/issues/detail?id=4083
Re: #9, Trevor, you might have missed what "does not nest well" was
intended to mean in the isssue subject. \keepWithTag works fine with
nested {} and <<>> music; the difficulty is combining independent usages of
\keepWithTag.
\keepWithTag A means remove music with any tags other than A, but as we add
tags for different purposes, we no longer want to remove all other tags
than A, just those for the same purpose as A. Now that the tags can be a
list, we can make things work, if we consider all the uses of tags when we
choose the list for each application of \keepWithTag.
What we still cannot do is apply \keepWithTag for one purpose (such as to
make intermediate variables below) without knowing about all other uses of
tags.
notes = \relative {
a'4 -\tag#'violin ^"pizz" -\tag#'flute ^"non legato" -\tag#'viola ^"con
legno" \mp
a a
<< \tag #'trills { c4 \trill }
\tag #'expand { \repeat unfold 4 { d32 c } }
>>
<<\repeat unfold 6 b1
\tag #'part {
\set countPercentRepeats= ##t
\hide PercentRepeat \repeat percent 6 s1} >> }
\keepWithTag part.violin.trills \notes
\new StaffGroup <<
\keepWithTag violin.trills \notes
\keepWithTag flute.trills \notes
\include "chooseWithTag.ly"
trillVersion = \clearTags trills \chooseWithTag trills \notes
expandVersion = \clearTags expand \removeWithTag trills \notes
\keepWithTag part.violin \trillVersion
\keepWithTag part.violin \expandVersion
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