src/vs/platform/configuration/common/configurationModels.ts/Configuration/compareAndUpdateFolderConfiguration
class Configuration:	compareAndUpdateFolderConfiguration(resource: URI, folderConfiguration: ConfigurationModel): IConfigurationChange {
		const currentFolderConfiguration = this.folderConfigurations.get(resource);
		const { added, updated, removed, overrides } = compare(currentFolderConfiguration, folderConfiguration);
		let keys = [...added, ...updated, ...removed];
		if (keys.length || !currentFolderConfiguration) {
			this.updateFolderConfiguration(resource, folderConfiguration);
		}
		return { keys, overrides };
	}