public GraphDisplayOptionsBuilder defaultEdgeColor(Color c) {
		Objects.requireNonNull(c);
		displayOptions.setDefaultEdgeColor(c);
		return this;
	}
Sets the default edge color for edges that don't have a registered edge type
@param c the default edge color
@return this GraphDisplayOptionsBuilder
Ghidra/Framework/Graph/src/main/java/ghidra/service/graph/GraphDisplayOptionsBuilder.java