src/vs/platform/configuration/common/configurationService.ts/ConfigurationService/onDidDefaultConfigurationChange
class ConfigurationService:	private onDidDefaultConfigurationChange(keys: string[]): void {
		const previous = this.configuration.toData();
		const change = this.configuration.compareAndUpdateDefaultConfiguration(new DefaultConfigurationModel(), keys);
		this.trigger(change, previous, ConfigurationTarget.DEFAULT);
	}