I thought that
\keepWithTag #'(A B) \music
and
\keepWithTag #'A {\keepWithTag #'B \music}
would be equivalent. But according to the following test it doesn't.
1 Could you please confirm they are not the same?
2 Is it because \keepWithTag create a list of tags starting always
from the empty list?
* * *
The following code is a running example. It prints 4 staves: test A,
test B, test C, test D. I expected test A and test B would be
identical and also test C and test D.
\version "2.19.40"
note =
{
\tag #'screenOut
{
\tag#'letter c'^\markup {M}
\tag#'noLetter c'
}
}
music =
{
a \note
}
% test A
\score
{
\keepWithTag #'(screenOut letter) \music
}
% test B
\score
{
\keepWithTag #'screenOut {\keepWithTag #'letter \music}
}
% test C
\score
{
\keepWithTag #'(screenOut noLetter) \music
}
% test D
\score
{
\keepWithTag #'screenOut {\keepWithTag #'noLetter \music}
}
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