src/vs/workbench/services/label/common/labelService.ts/LabelService/appendWorkspaceSuffix
class LabelService:	private appendWorkspaceSuffix(label: string, uri: URI): string {
		const formatting = this.findFormatting(uri);
		const suffix = formatting && (typeof formatting.workspaceSuffix === 'string') ? formatting.workspaceSuffix : undefined;
		return suffix ? `${label} [${suffix}]` : label;
	}