Don't reload roomview on offline connectivity check (#29243)

* Don't reload roomview on offline connectivity check

Doesn't look like this was a regression as far as I can see, but
you did have to switch rooms while offline for it to start happening.

There's no use reloading the room until we're online again.

Fixes https://github.com/element-hq/element-web/issues/29072

* Add regression test

* Move it down the file to avoid changing the snapshots

test/unit-tests/components/structures/RoomView-test.tsx

@@ -693,6 +693,31 @@ describe("RoomView", () => {
         expect(defaultDispatcher.dispatch).toHaveBeenCalledWith({ action: Action.RoomLoaded });
     });
 
+    // Regression test for https://github.com/element-hq/element-web/issues/29072
+    it("does not force a reload on sync unless the client is coming back online", async () => {
+        cli.isInitialSyncComplete.mockReturnValue(false);
+
+        const instance = await getRoomViewInstance();
+        const onRoomViewUpdateMock = jest.fn();
+        (instance as any).onRoomViewStoreUpdate = onRoomViewUpdateMock;
+
+        act(() => {
+            // As if a connectivity check happened (we are still offline)
+            defaultDispatcher.dispatch({ action: "MatrixActions.sync" }, true);
+            // ...so it still should not force a reload
+            expect(onRoomViewUpdateMock).not.toHaveBeenCalledWith(true);
+        });
+
+        act(() => {
+            // set us to online again
+            cli.isInitialSyncComplete.mockReturnValue(true);
+            defaultDispatcher.dispatch({ action: "MatrixActions.sync" }, true);
+        });
+
+        // It should now force a reload
+        expect(onRoomViewUpdateMock).toHaveBeenCalledWith(true);
+    });
+
     describe("when there is a RoomView", () => {
         const widget1Id = "widget1";
         const widget2Id = "widget2";