src/vs/workbench/services/preferences/common/preferencesModels.ts/Settings2EditorModel/constructor
class Settings2EditorModel:	constructor(
		private _defaultSettings: DefaultSettings,
		@IConfigurationService configurationService: IConfigurationService,
	) {
		super();

		this._register(configurationService.onDidChangeConfiguration(e => {
			if (e.source === ConfigurationTarget.DEFAULT) {
				this.dirty = true;
				this._onDidChangeGroups.fire();
			}
		}));
		this._register(Registry.as<IConfigurationRegistry>(Extensions.Configuration).onDidSchemaChange(e => {
			this.dirty = true;
			this._onDidChangeGroups.fire();
		}));
	}