src/vs/workbench/contrib/preferences/browser/preferencesEditor.ts/PreferencesRenderersController/_flatten
class PreferencesRenderersController:	private _flatten(settingsGroups: ISettingsGroup[]): ISetting[] {
		const settings: ISetting[] = [];
		for (const group of settingsGroups) {
			for (const section of group.sections) {
				settings.push(...section.settings);
			}
		}

		return settings;
	}