Graphs can have a "transparent" attribute to make them ... transparent. Change-Id: I7772943b92a0c46bc8d7cd5ae7255f4de774bdcf
I was trying to figure out how to do multiple target calculations with hidden targets. I didn't see this explicitly tested for, so add it. Change-Id: Ibbbb2810dd531e792f11c07946c21829fcdbe0a1