simplechat client requires restart after authentication failure

[eugmes]

Describe the bug
simplechat example client does not seem to send credentials to the server after entering password incorrectly once. A restart is required to enter new credentials

To Reproduce

1. Run simplechatserver example
2. Run simplechat example
3. Enter invalid credentials, observe an Authentication failed message in the server output.
4. Try entering other credentials in the client, the server does not print any messages this time.

Expected behavior
It should be possible to retry entering credentials in the client without a restart.

Environment:

• OS: Debian unstable
• Version eb1a8b5, built with all 3rd party submodules

Additional context

The client prints these messages to console:

Attribute Qt::AA_EnableHighDpiScaling must be set before QCoreApplication is created.
qrc:/main.qml:113:9: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
qtprotobuflog: "messageList" call "qtprotobuf.examples.SimpleChat" stream finished:  "Невідома помилка"

The last message translates "Unknown error".

[semlanik]

Thanks! There are couple issues in gRPC stream implementation. I need to complete the refactoring one day.