src/vs/workbench/contrib/preferences/browser/preferencesEditor.ts/PreferencesRenderersController/focusNextPreference
class PreferencesRenderersController:	focusNextPreference(forward: boolean = true) {
		if (!this._settingsNavigator) {
			return;
		}

		const setting = forward ? this._settingsNavigator.next() : this._settingsNavigator.previous();
		this._focusPreference(setting, this._defaultPreferencesRenderer);
		this._focusPreference(setting, this._editablePreferencesRenderer);
	}