private static DataFlavor createLocalTreeNodeFlavor() {
		return new GenericDataFlavor(
			DataFlavor.javaJVMLocalObjectMimeType + "; class=java.util.ArrayList",
			"Local list of Tree Nodes");
	}
Defines data that is available for drag/drop and clipboard transfers.
The data is an ArrayList of ProgramNode objects.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/programtree/ProgramTreeTransferable.java