If those are your only use cases, I would strongly consider just dropping GWTQuery (before or after updating GWT) and using plain dom manipulation to achieve your goals.
Before updating - com.google.gwt.dom.client.Element has a setId(String) and a scrollIntoView() method. Hiding rows could probably also be achieved with plain Element calls (adding styles or classes).
After updating to something that supports JsInterop and/or Elemental2, you could use those tools to avoid writing JSNI or using the Element class.