Add dialog to navigate long room topics (#8517)

src/components/views/elements/Linkify.tsx

@@ -0,0 +1,39 @@
+/*
+Copyright 2022 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import React, { useEffect, useRef } from "react";
+import linkifyElement from "linkify-element";
+
+interface Props {
+    as?: string;
+    children: React.ReactNode;
+}
+
+export function Linkify({
+    as = "div",
+    children,
+}: Props): JSX.Element {
+    const ref = useRef();
+
+    useEffect(() => {
+        linkifyElement(ref.current);
+    }, [children]);
+
+    return React.createElement(as, {
+        children,
+        ref,
+    });
+}