src/vs/workbench/contrib/terminal/browser/terminalGroupService.ts/TerminalGroupService/getGroupLabels
class TerminalGroupService:	getGroupLabels(): string[] {
		return this.groups.filter(group => group.terminalInstances.length > 0).map((group, index) => {
			return `${index + 1}: ${group.title ? group.title : ''}`;
		});
	}