src/vs/workbench/contrib/preferences/browser/settingsTree.ts/SettingTreeRenderers/getKeyForDOMElementInSetting
class SettingTreeRenderers:	getKeyForDOMElementInSetting(element: HTMLElement): string | null {
		const settingElement = this.getSettingDOMElementForDOMElement(element);
		return settingElement && settingElement.getAttribute(AbstractSettingRenderer.SETTING_KEY_ATTR);
	}