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Define utility macro make-relative
This is actually a whole bunch of different interesting issues that
are intertwined enough to actually warrant about three different
issues after another. However, since make-relative is what has
actually been asked for, and most of the other work is just related to
making the regtest work out usefully, I am sorting this under
"make-relative".
The sequence of commits (as usual in reverse) is
Add make-relative regtest
This steals a bit of the Bach prelude #1 in the Well-Tempered Piano
for demonstrating how to create a relative-cooperating utility macro.
Define utility macro make-relative
This is useful for creating music functions getting pitch arguments
that behave "naturally" when placed within \relative.
Let \parallelMusic deal with barchecks at arbitrary depth
This lets \parallelMusic react to bar checks at arbitrary depth to
make it more useful in connection with music functions.
Use new music-clone arguments in \endSpanners
Give music-clone additional rest argument to justify its existence
Otherwise we could just use ly:music-deep-copy
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