`startSyncing` does not allow to save wallet until sync completes

[mainnet-pat]

If I install a listener for wallet sync and try to save the wallet periodically while it syncing (so that the sync process is not lost between browser page reloads) the call to save hangs indefinitely.

The very slow workaround here is to do:

            await wallet.stopSyncing();
            await wallet.save();
            await wallet.startSyncing(15000);