src/vs/platform/userDataSync/common/userDataSync.ts/getDefaultIgnoredSettings
export function getDefaultIgnoredSettings(): string[] {
	const allSettings = Registry.as<IConfigurationRegistry>(ConfigurationExtensions.Configuration).getConfigurationProperties();
	const ignoreSyncSettings = Object.keys(allSettings).filter(setting => !!allSettings[setting].ignoreSync);
	const machineSettings = Object.keys(allSettings).filter(setting => allSettings[setting].scope === ConfigurationScope.MACHINE || allSettings[setting].scope === ConfigurationScope.MACHINE_OVERRIDABLE);
	const disallowedSettings = getDisallowedIgnoredSettings();
	return distinct([CONFIGURATION_SYNC_STORE_KEY, ...ignoreSyncSettings, ...machineSettings, ...disallowedSettings]);
}