fix: Down arrow in search input should move focus to results (#2257)

closes #2253

app/scenes/Search/Search.js

@@ -6,7 +6,6 @@ import { observer, inject } from "mobx-react";
 import { PlusIcon } from "outline-icons";
 import queryString from "query-string";
 import * as React from "react";
-import ReactDOM from "react-dom";
 import { withTranslation, Trans, type TFunction } from "react-i18next";
 import keydown from "react-keydown";
 import { withRouter, Link } from "react-router-dom";
@@ -103,8 +102,9 @@ class Search extends React.Component<Props> {
     if (ev.key === "ArrowDown") {
       ev.preventDefault();
       if (this.firstDocument) {
-        const element = ReactDOM.findDOMNode(this.firstDocument);
-        if (element instanceof HTMLElement) element.focus();
+        if (this.firstDocument instanceof HTMLElement) {
+          this.firstDocument.focus();
+        }
       }
     }
   };