src/vs/workbench/browser/actions/navigationActions.ts/BaseNavigationAction/navigateToSidebar
class BaseNavigationAction:	private async navigateToSidebar(): Promise<IViewlet | boolean> {
		if (!this.layoutService.isVisible(Parts.SIDEBAR_PART)) {
			return false;
		}

		const activeViewlet = this.viewletService.getActiveViewlet();
		if (!activeViewlet) {
			return false;
		}
		const activeViewletId = activeViewlet.getId();

		const viewlet = await this.viewletService.openViewlet(activeViewletId, true);
		return !!viewlet;
	}