src/vs/platform/configuration/common/configurationService.ts/ConfigurationService/onDidChangeUserConfiguration
class ConfigurationService:	private onDidChangeUserConfiguration(userConfigurationModel: ConfigurationModel): void {
		const previous = this.configuration.toData();
		const change = this.configuration.compareAndUpdateLocalUserConfiguration(userConfigurationModel);
		this.trigger(change, previous, ConfigurationTarget.USER);
	}