src/vs/workbench/browser/parts/views/viewsService.ts/ViewsService/getViewContainerProgressIndicator
class ViewsService:	private getViewContainerProgressIndicator(viewContainer: ViewContainer): IProgressIndicator | undefined {
		return this.viewDescriptorService.getViewContainerLocation(viewContainer) === ViewContainerLocation.Sidebar ? this.viewletService.getProgressIndicator(viewContainer.id) : this.panelService.getProgressIndicator(viewContainer.id);
	}