RoomListStoreV3: Only add new rooms that pass VisibilityProvider check (#29974)

* Add new rooms only after checking VisibilityProvider

Otherwise we might end up adding space rooms and other rooms that must
be hidden.

* Write test

src/stores/room-list-v3/RoomListStoreV3.ts

@@ -321,8 +321,17 @@ export class RoomListStoreV3Class extends AsyncStoreWithClient<EmptyObject> {
      */
     private addRoomAndEmit(room: Room, isNewRoom = false): void {
         if (!this.roomSkipList) throw new Error("roomSkipList hasn't been created yet!");
-        if (isNewRoom) this.roomSkipList.addNewRoom(room);
+        if (isNewRoom) {
-        else this.roomSkipList.reInsertRoom(room);
+            if (!VisibilityProvider.instance.isRoomVisible(room)) {
+                logger.info(
+                    `RoomListStoreV3: Refusing to add new room ${room.roomId} because isRoomVisible returned false.`,
+                );
+                return;
+            }
+            this.roomSkipList.addNewRoom(room);
+        } else {
+            this.roomSkipList.reInsertRoom(room);
+        }
         this.emit(LISTS_UPDATE_EVENT);
     }
 

test/unit-tests/stores/room-list-v3/RoomListStoreV3-test.ts

@@ -416,6 +416,32 @@ describe("RoomListStoreV3", () => {
         }
 
         describe("Spaces", () => {
+            it("Newly created space is not added by the store", async () => {
+                const { client, rooms } = getClientAndRooms();
+                const infoSpy = jest.spyOn(logger, "info");
+
+                const store = new RoomListStoreV3Class(dispatcher);
+                await store.start();
+
+                // Create a space and let the store know about it
+                const { spaceRoom } = createSpace(rooms, [6, 8, 13, 27, 75], client);
+                dispatcher.dispatch(
+                    {
+                        action: "MatrixActions.Room.myMembership",
+                        oldMembership: KnownMembership.Leave,
+                        membership: KnownMembership.Invite,
+                        room: spaceRoom,
+                    },
+                    true,
+                );
+
+                // Space room should not be added
+                expect(store.getSortedRooms()).not.toContain(spaceRoom);
+                expect(infoSpy).toHaveBeenCalledWith(
+                    expect.stringContaining("RoomListStoreV3: Refusing to add new room"),
+                );
+            });
+
             it("Filtering by spaces work", async () => {
                 const { client, rooms } = getClientAndRooms();
                 // Let's choose 5 rooms to put in space