src/vs/workbench/contrib/outline/browser/outlineViewState.ts/OutlineViewState/restore
class OutlineViewState:	restore(storageService: IStorageService): void {
		const raw = storageService.get('outline/state', StorageScope.WORKSPACE);
		if (!raw) {
			return;
		}
		let data: any;
		try {
			data = JSON.parse(raw);
		} catch (e) {
			return;
		}
		this.followCursor = data.followCursor;
		this.sortBy = data.sortBy ?? OutlineSortOrder.ByPosition;
		if (typeof data.filterOnType === 'boolean') {
			this.filterOnType = data.filterOnType;
		}
	}