@Override
	public boolean isLeaf() {
		return false;
	}
For this plugin there are two trees side by side.
This tree is on the right.  This node is the "root" or at the top of that tree.  All nodes that flow from it
are actually LOWER in the call stack. They are nodes that ARE CALLED OUT OF this node via
some call path.
Ghidra/Features/DecompilerDependent/src/main/java/ghidra/app/plugin/core/decompiler/taint/slicetree/OutSliceRootNode.java