static void DeleteElementsFromGraph(State previousState, IReadOnlyCollection <IGTFGraphElementModel> elementsToRemove, GraphModel graphModel)
{
IGTFGraphElementModel[] deletables = elementsToRemove.Where(x => x is IDeletable).Distinct().ToArray();
var vsGraphModel = (VSGraphModel)graphModel;
IStickyNoteModel[] stickyNotesToDelete = GetStickyNotesToDelete(deletables);
IPlacematModel[] placematsToDelete = GetPlacematsToDelete(deletables);
IReadOnlyCollection <INodeModel> nodesToDelete = GetNodesToDelete(vsGraphModel, deletables);
IReadOnlyCollection <IEdgeModel> edgesToDelete = GetEdgesToDelete(graphModel, deletables, nodesToDelete);
VariableDeclarationModel[] declarationModelsToDelete = GetDeclarationModelsToDelete(deletables, nodesToDelete);
if (declarationModelsToDelete.Any())
{
previousState.MarkForUpdate(UpdateFlags.RequestRebuild);
}
graphModel.DeleteStickyNotes(stickyNotesToDelete);
graphModel.DeletePlacemats(placematsToDelete);
graphModel.DeleteEdges(edgesToDelete);
graphModel.DeleteNodes(nodesToDelete, GraphModel.DeleteConnections.False);
vsGraphModel.DeleteVariableDeclarations(declarationModelsToDelete, false);
}