src/vs/workbench/services/preferences/common/preferencesModels.ts/DefaultSettings/toContent
class DefaultSettings:	private toContent(settingsGroups: ISettingsGroup[], startIndex: number): string {
		const builder = new SettingsContentBuilder();
		for (let i = startIndex; i < settingsGroups.length; i++) {
			builder.pushGroup(settingsGroups[i], i === startIndex, i === settingsGroups.length - 1);
		}
		return builder.getContent();
	}