public void removeGroupListener(GroupListener listener) {
		if (groupListener != null && groupListener != listener) {
			throw new AssertException("Update code to handle multiple listeners!");
		}

		groupListener = null;
	}
Creates a new group based upon this one, but with the given vertices (and incident edges)
removed. 

@param verticesToRemove the vertices to not include in the new group
@return the new group
Ghidra/Features/FunctionGraph/src/main/java/ghidra/app/plugin/core/functiongraph/graph/vertex/GroupedFunctionGraphVertex.java