XCB: QWindow doesn't restore fullscreen window state

void MainWindow::showExpanded()
{
    showFullScreen();
}

// Custom minimize button calls that function.
void MainWindow::minimize()
{
    showMinimized();
}


//WORKAROUND under linux
void MainWindow::onWindowStateChanged(Qt::WindowState state)
{
    //INFO: Somehow Qt5 doesn't restore fullscreen state when we minimize the application.
    //WORKAROUND: restore minimize the fullscreen on linux.
#if defined(Q_OS_LINUX)
    static bool isMinimized = false;
    static Qt::WindowState previousState = state;
    if (previousState == Qt::WindowNoState && state == Qt::WindowMinimized) {
        isMinimized = true;
    }
    else if (isMinimized && state == Qt::WindowNoState) {
        isMinimized = false;
        this->showFullScreen();
    }
    previousState = state;
#endif
}