src/vs/platform/configuration/common/configurationRegistry.ts/ConfigurationRegistry/updateConfigurations
class ConfigurationRegistry:	public updateConfigurations({ add, remove }: { add: IConfigurationNode[]; remove: IConfigurationNode[] }): void {
		const properties = [];
		properties.push(...this.doDeregisterConfigurations(remove));
		properties.push(...this.doRegisterConfigurations(add, false));

		contributionRegistry.registerSchema(resourceLanguageSettingsSchemaId, this.resourceLanguageSettingsSchema);
		this._onDidSchemaChange.fire();
		this._onDidUpdateConfiguration.fire({ properties: distinct(properties) });
	}