src/vs/workbench/contrib/outline/browser/outlineViewState.ts/OutlineViewState/persist
class OutlineViewState:	persist(storageService: IStorageService): void {
		storageService.store('outline/state', JSON.stringify({
			followCursor: this.followCursor,
			sortBy: this.sortBy,
			filterOnType: this.filterOnType,
		}), StorageScope.WORKSPACE, StorageTarget.USER);
	}