private void removeOldVertexAndEdges() {
		Collection<FGVertex> vertices = getVerticesToBeRemoved();
		graph.removeVertices(vertices);
	}
Constructor

@param controller the controller of the graph to be ungrouped
@param groupVertex The group vertex to be ungrouped
@param newVertices the vertices that will remain after the grouping/ungrouping process has
                   completed
@param verticesToRemove the vertices that will be removed from the graph after the 
                        grouping/ungrouping process has completed
@param relayoutOverride a boolean that when true signals to perform a layout <b>
		  	  			   regardless of the user's relayout options</b>.  This is required to
                        perform a manual relayout.
@param useAnimation whether to use animation
Ghidra/Features/FunctionGraph/src/main/java/ghidra/app/plugin/core/functiongraph/util/job/AbstractGroupingFunctionGraphJob.java