src/vs/workbench/contrib/preferences/browser/preferencesEditor.ts/PreferencesEditor/_countById
class PreferencesEditor:	private _countById(settingsGroups: ISettingsGroup[]): IStringDictionary<number> {
		const result: IStringDictionary<number> = {};

		for (const group of settingsGroups) {
			let i = 0;
			for (const section of group.sections) {
				i += section.settings.length;
			}

			result[group.id] = i;
		}

		return result;
	}