src/vs/base/browser/ui/tree/compressedObjectTreeModel.ts/CompressibleObjectTreeModel/onDidSplice
class CompressibleObjectTreeModel:	get onDidSplice(): Event<ITreeModelSpliceEvent<T | null, TFilterData>> {
		return Event.map(this.model.onDidSplice, ({ insertedNodes, deletedNodes }) => ({
			insertedNodes: insertedNodes.map(node => this.nodeMapper.map(node)),
			deletedNodes: deletedNodes.map(node => this.nodeMapper.map(node)),
		}));
	}