Please look this commit:
https://github.com/blackwarthog/synfig/commit/1fa6e2e61f134ab727d907a09f657337c3bf5ba9
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I think that curveset.cpp as well as booleancurve.cpp (and their headers)
are unfinished code from original developer (darco), with the intention of
create a layer that can hold multishapes in it (with boolean operations
between them).
Would be cool to have!
2013/8/30 Ivan Mahonin
Ok. I've commented the unused code. May be it will need in future.
I think that curveset.cpp as well as booleancurve.cpp (and their headers)
are unfinished code from original developer (darco), with the intention of
create a layer that can hold multishapes in it (with boolean operations