private void performInternalUpdate(Callback c) {
		internalCallCount++;
		try {
			c.call();
		}
		finally {
			internalCallCount--;
		}
	}
This method is to be called internally to remove an edge from this graph, but not the
underlying 'complete graph'.

@param e the edge
Ghidra/Framework/Graph/src/main/java/ghidra/graph/graphs/FilteringVisualGraph.java