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

src/components/structures/RoomView.tsx

@@ -1151,13 +1151,14 @@ export class RoomView extends React.Component<IRoomProps, IRoomState> {
                 break;
             case "MatrixActions.sync":
                 if (!this.state.matrixClientIsReady) {
+                    const isReadyNow = Boolean(this.context.client?.isInitialSyncComplete());
                     this.setState(
                         {
-                            matrixClientIsReady: !!this.context.client?.isInitialSyncComplete(),
+                            matrixClientIsReady: isReadyNow,
                         },
                         () => {
                             // send another "initial" RVS update to trigger peeking if needed
-                            this.onRoomViewStoreUpdate(true);
+                            if (isReadyNow) this.onRoomViewStoreUpdate(true);
                         },
                     );
                 }