support matrix.to links (#1849)

* support room via server params and eventId

* change copy link to matrix.to links

* display matrix.to links in messages as pill and stop generating url previews for them

* improve editor mention to include viaServers and eventId

* fix mention custom attributes

* always try to open room in current space

* jump to latest remove target eventId from url

* add create direct search options to open/create dm with url

src/app/pages/client/direct/DirectCreate.tsx

@@ -0,0 +1,33 @@
+import React, { useEffect } from 'react';
+import { useNavigate, useSearchParams } from 'react-router-dom';
+import { WelcomePage } from '../WelcomePage';
+import { useMatrixClient } from '../../../hooks/useMatrixClient';
+import { getDirectCreateSearchParams } from '../../pathSearchParam';
+import { getDirectPath, getDirectRoomPath } from '../../pathUtils';
+import { getDMRoomFor } from '../../../utils/matrix';
+import { openInviteUser } from '../../../../client/action/navigation';
+import { useDirectRooms } from './useDirectRooms';
+
+export function DirectCreate() {
+  const mx = useMatrixClient();
+  const navigate = useNavigate();
+  const [searchParams] = useSearchParams();
+  const { userId } = getDirectCreateSearchParams(searchParams);
+  const directs = useDirectRooms();
+
+  useEffect(() => {
+    if (userId) {
+      const room = getDMRoomFor(mx, userId);
+      const { roomId } = room ?? {};
+      if (roomId && directs.includes(roomId)) {
+        navigate(getDirectRoomPath(roomId), { replace: true });
+      } else {
+        openInviteUser(undefined, userId);
+      }
+    } else {
+      navigate(getDirectPath(), { replace: true });
+    }
+  }, [mx, navigate, directs, userId]);
+
+  return <WelcomePage />;
+}