private static String getUniqueId(List<AttributedVertex> vertexList) {
		if (vertexList.size() > MAX_IDS_TO_COMBINE) {
			int idsNotShownCount = vertexList.size() - MAX_IDS_TO_COMBINE;
			return combineIds(vertexList.subList(0, MAX_IDS_TO_COMBINE)) + "\n...\n + " +
				idsNotShownCount + " Others";
		}
		return combineIds(vertexList);
	}
Returns a set of vertices such that all non-group nodes in the given vertices are included
and any group nodes in the given vertices are replaced with their contained vertices.

@param vertices the collection of vertices to flatten into a set of non-group vertices.
@return a set of non-group vertices derived from the given collection where all the group
vertices have been replace with their contained vertices.
Ghidra/Features/GraphServices/src/main/java/ghidra/graph/visualization/GroupVertex.java