src/vs/workbench/browser/parts/sidebar/sidebarPart.ts/FocusSideBarAction/run
class FocusSideBarAction:	async run(accessor: ServicesAccessor): Promise<void> {
		const layoutService = accessor.get(IWorkbenchLayoutService);
		const viewletService = accessor.get(IViewletService);

		// Show side bar
		if (!layoutService.isVisible(Parts.SIDEBAR_PART)) {
			layoutService.setSideBarHidden(false);
			return;
		}

		// Focus into active viewlet
		const viewlet = viewletService.getActiveViewlet();
		if (viewlet) {
			viewlet.focus();
		}
	}