src/vs/base/browser/ui/tree/compressedObjectTreeModel.ts/CompressedObjectTreeModel/setCollapsible
class CompressedObjectTreeModel:	setCollapsible(location: T | null, collapsible?: boolean): boolean {
		const compressedNode = this.getCompressedNode(location);
		return this.model.setCollapsible(compressedNode, collapsible);
	}