Fix RoomView ignoring alias lookup errors due to them not knowing the roomId

src/components/structures/RoomView.tsx

@@ -514,7 +514,7 @@ export class RoomView extends React.Component<IRoomProps, IRoomState> {
     /**
      * Removes the Jitsi widget from the current user if
      * - Multiple Jitsi widgets have been added within {@link PREVENT_MULTIPLE_JITSI_WITHIN}
-     * - The last (server timestamp) of these widgets is from the currrent user
+     * - The last (server timestamp) of these widgets is from the current user
      * This solves the issue if some people decide to start a conference and click the call button at the same time.
      */
     private doMaybeRemoveOwnJitsiWidget(): void {
@@ -587,7 +587,8 @@ export class RoomView extends React.Component<IRoomProps, IRoomState> {
             return;
         }
 
-        if (!initial && this.state.roomId !== this.context.roomViewStore.getRoomId()) {
+        const roomLoadError = this.context.roomViewStore.getRoomLoadError() ?? undefined;
+        if (!initial && !roomLoadError && this.state.roomId !== this.context.roomViewStore.getRoomId()) {
             // RoomView explicitly does not support changing what room
             // is being viewed: instead it should just be re-mounted when
             // switching rooms. Therefore, if the room ID changes, we
@@ -609,7 +610,7 @@ export class RoomView extends React.Component<IRoomProps, IRoomState> {
             roomId: roomId ?? undefined,
             roomAlias: this.context.roomViewStore.getRoomAlias() ?? undefined,
             roomLoading: this.context.roomViewStore.isRoomLoading(),
-            roomLoadError: this.context.roomViewStore.getRoomLoadError() ?? undefined,
+            roomLoadError,
             joining: this.context.roomViewStore.isJoining(),
             replyToEvent: this.context.roomViewStore.getQuotingEvent() ?? undefined,
             // we should only peek once we have a ready client

test/components/structures/RoomView-test.tsx

@@ -19,7 +19,7 @@ import { mocked, MockedObject } from "jest-mock";
 import { ClientEvent, MatrixClient } from "matrix-js-sdk/src/client";
 import { Room, RoomEvent } from "matrix-js-sdk/src/models/room";
 import { MatrixEvent } from "matrix-js-sdk/src/models/event";
-import { EventType, RoomStateEvent } from "matrix-js-sdk/src/matrix";
+import { EventType, MatrixError, RoomStateEvent } from "matrix-js-sdk/src/matrix";
 import { MEGOLM_ALGORITHM } from "matrix-js-sdk/src/crypto/olmlib";
 import { fireEvent, render, screen, RenderResult } from "@testing-library/react";
 
@@ -34,6 +34,7 @@ import {
     filterConsole,
     mkRoomMemberJoinEvent,
     mkThirdPartyInviteEvent,
+    emitPromise,
 } from "../../test-utils";
 import { MatrixClientPeg } from "../../../src/MatrixClientPeg";
 import { Action } from "../../../src/dispatcher/actions";
@@ -55,6 +56,7 @@ import VoipUserMapper from "../../../src/VoipUserMapper";
 import WidgetUtils from "../../../src/utils/WidgetUtils";
 import { WidgetType } from "../../../src/widgets/WidgetType";
 import WidgetStore from "../../../src/stores/WidgetStore";
+import { ViewRoomErrorPayload } from "../../../src/dispatcher/payloads/ViewRoomErrorPayload";
 
 // Fake random strings to give a predictable snapshot for IDs
 jest.mock("matrix-js-sdk/src/randomstring", () => ({
@@ -138,8 +140,8 @@ describe("RoomView", () => {
         return roomView;
     };
 
-    const renderRoomView = async (): Promise<ReturnType<typeof render>> => {
-        if (stores.roomViewStore.getRoomId() !== room.roomId) {
+    const renderRoomView = async (switchRoom = true): Promise<ReturnType<typeof render>> => {
+        if (switchRoom && stores.roomViewStore.getRoomId() !== room.roomId) {
             const switchedRoom = new Promise<void>((resolve) => {
                 const subFn = () => {
                     if (stores.roomViewStore.getRoomId()) {
@@ -497,4 +499,19 @@ describe("RoomView", () => {
             });
         });
     });
+
+    it("should show error view if failed to look up room alias", async () => {
+        const { asFragment, findByText } = await renderRoomView(false);
+
+        defaultDispatcher.dispatch<ViewRoomErrorPayload>({
+            action: Action.ViewRoomError,
+            room_alias: "#addy:server",
+            room_id: null,
+            err: new MatrixError({ errcode: "M_NOT_FOUND" }),
+        });
+        await emitPromise(stores.roomViewStore, UPDATE_EVENT);
+
+        await findByText("Are you sure you're at the right place?");
+        expect(asFragment()).toMatchSnapshot();
+    });
 });

test/components/structures/__snapshots__/RoomView-test.tsx.snap

@@ -809,3 +809,32 @@ exports[`RoomView for a local room in state NEW that is encrypted should match t
   </div>
 </div>
 `;
+
+exports[`RoomView should show error view if failed to look up room alias 1`] = `
+<DocumentFragment>
+  <div
+    class="mx_RoomView"
+  >
+    <div
+      class="mx_RoomPreviewBar dark-panel mx_RoomPreviewBar_RoomNotFound mx_RoomPreviewBar_dialog"
+    >
+      <div
+        class="mx_RoomPreviewBar_message"
+      >
+        <h3>
+          #addy:server does not exist.
+        </h3>
+        <p>
+          Are you sure you're at the right place?
+        </p>
+      </div>
+      <div
+        class="mx_RoomPreviewBar_actions"
+      />
+      <div
+        class="mx_RoomPreviewBar_footer"
+      />
+    </div>
+  </div>
+</DocumentFragment>
+`;