Wt

Hello,

Consider the following example. After the model is filled, the current index is explicitly set to -1. Nevertheless, at the next event loop, Wt changes the index to 0.

Application::Application(const Wt::WEnvironment& env) : Wt::WApplication(env)
{
    auto comboBox = root()->addWidget(std::make_unique<Wt::WComboBox>());
    comboBox->setNoSelectionEnabled(true);

    auto model = std::make_shared<Wt::WStringListModel>();
    comboBox->setModel(model);

    auto button = root()->addWidget(std::make_unique<Wt::WPushButton>("Reset ComboBox"));

    button->clicked().connect([model, comboBox]() {
        model->setStringList({ {"blah"} });
        Wt::WTimer::singleShot(std::chrono::milliseconds(0), [comboBox]() {
            int currentIndex2 = comboBox->currentIndex(); // currentIndex2 is 0 ???
        });
        comboBox->setCurrentIndex(-1);
        int currentIndex1 = comboBox->currentIndex(); // currentIndex1 is -1
    });
}