Wt

I have an application that loads data into a WTable that is initially empty

At start , the widgets are layout as below

But when the WTable is populated the widgets in the layout change form (become much bigger, etc)

Is there a way to avoid this resizing , by code or CSS ?

available at

https://github.com/pedro-vicente/nostr_client_relay

in case you want to give it a try

CSS is

.yellow-box
{
    background-color: #FFE4C4;
    border: 1px solid black;
    margin-top: 1ex;
    margin-bottom: 1ex;
}

.table_messages td, .table_messages th 
{
  border: 1px solid #ddd;
  padding: 8px;
}

.table_messages tr:nth-child(even){background-color: #f2f2f2;}

.table_messages tr:hover {background-color: #ddd;}

code is

NostroApplication::NostroApplication(const Wt::WEnvironment& env)
  : WApplication(env), m_row(0)
{
  useStyleSheet("nostro.css");
  root()->setStyleClass("yellow-box");
  setTitle("Nostro");
  const int width = 500;

  auto container = std::make_unique<Wt::WContainerWidget>();
  auto box_main = container->setLayout(std::make_unique<Wt::WHBoxLayout>());
  auto box_left = box_main->addLayout(std::make_unique<Wt::WVBoxLayout>());
  auto box_right = box_main->addLayout(std::make_unique<Wt::WVBoxLayout>());

  /////////////////////////////////////////////////////////////////////////////////////////////////////
  //input, left
  /////////////////////////////////////////////////////////////////////////////////////////////////////

  std::string local = "localhost:8080/nostr";
  std::string uri = "relay.snort.social";

  box_left->addWidget(std::make_unique<Wt::WText>("Relay Uri"));
  m_edit_uri = box_left->addWidget(std::make_unique<Wt::WLineEdit>());
  m_edit_uri->setText(uri);
  m_edit_uri->setWidth(200);

  /////////////////////////////////////////////////////////////////////////////////////////////////////
  //radion buttons, select EVENT or REQ
  /////////////////////////////////////////////////////////////////////////////////////////////////////

  m_button_message = std::make_shared<Wt::WButtonGroup>();
  Wt::WRadioButton* button;
  button = box_left->addWidget(std::make_unique<Wt::WRadioButton>("Event"));
  button->setInline(true);
  m_button_message->addButton(button);
  button = box_left->addWidget(std::make_unique<Wt::WRadioButton>("Request"));
  button->setInline(true);
  m_button_message->addButton(button);
  m_button_message->setSelectedButtonIndex(0);

  /////////////////////////////////////////////////////////////////////////////////////////////////////
  //EVENT
  /////////////////////////////////////////////////////////////////////////////////////////////////////

  auto group_event = box_left->addWidget(std::make_unique<Wt::WGroupBox>("Event"));

  group_event->addWidget(std::make_unique<Wt::WText>("Public Key"));
  group_event->addWidget(std::make_unique<Wt::WBreak>());
  m_edit_key = group_event->addWidget(std::make_unique<Wt::WLineEdit>());
  m_edit_key->setWidth(width);
  group_event->addWidget(std::make_unique<Wt::WBreak>());

  group_event->addWidget(std::make_unique<Wt::WText>("Content"));
  group_event->addWidget(std::make_unique<Wt::WBreak>());

  m_area_content = group_event->addWidget(std::make_unique<Wt::WTextArea>());
  m_area_content->setInline(false);
  m_area_content->setColumns(80);
  m_area_content->resize(Wt::WLength::Auto, 100);

  /////////////////////////////////////////////////////////////////////////////////////////////////////
  //REQ
  /////////////////////////////////////////////////////////////////////////////////////////////////////

  auto group_request = box_left->addWidget(std::make_unique<Wt::WGroupBox>("Request"));

  group_request->addWidget(std::make_unique<Wt::WText>("Event id"));
  group_request->addWidget(std::make_unique<Wt::WBreak>());
  m_edit_event_id = group_request->addWidget(std::make_unique<Wt::WLineEdit>());
  m_edit_event_id->setWidth(width);
  group_request->addWidget(std::make_unique<Wt::WBreak>());

  /////////////////////////////////////////////////////////////////////////////////////////////////////
  //generated message
  /////////////////////////////////////////////////////////////////////////////////////////////////////

  box_left->addWidget(std::make_unique<Wt::WText>("Message"));

  m_area_input = box_left->addWidget(std::make_unique<Wt::WTextArea>());
  m_area_input->setInline(false);
  m_area_input->setColumns(100);
  m_area_input->resize(Wt::WLength::Auto, 200);
  m_area_input->setFocus();

  box_left->addWidget(std::make_unique<Wt::WBreak>());

  /////////////////////////////////////////////////////////////////////////////////////////////////////
  //buttons
  /////////////////////////////////////////////////////////////////////////////////////////////////////

  auto hbox_buttons = box_left->addLayout(std::make_unique<Wt::WHBoxLayout>());
  auto button_gen = hbox_buttons->addWidget(std::make_unique<Wt::WPushButton>("Generate message"));
  auto button_send = hbox_buttons->addWidget(std::make_unique<Wt::WPushButton>("Send message"));

  /////////////////////////////////////////////////////////////////////////////////////////////////////
  //output, right
  /////////////////////////////////////////////////////////////////////////////////////////////////////

  m_table_messages = box_right->addWidget(std::make_unique<Wt::WTable>());;
  m_table_messages->resize(1000, Wt::WLength::Auto);
  m_table_messages->setStyleClass("table_messages");

  button_send->clicked().connect(this, &NostroApplication::send_message);
  button_gen->clicked().connect(this, &NostroApplication::make_message);
  root()->addWidget(std::move(container));
}