[SFML] Błędny event GainedFocus po zmianie pozycji lub rozmiaru okna.

#include <SFML/Graphics.hpp>
#include <iostream>

int main()
{
    sf::RenderWindow app( sf::VideoMode( 320, 200 ), "SFML window" );
   
    while( app.isOpen() )
    {
        //app.setPosition(app.getPosition());
        app.setSize( app.getSize() );
       
        sf::Event event;
        while( app.pollEvent( event ) )
        {
            if( event.type == sf::Event::Closed )
                 app.close();
            else if( event.type == sf::Event::LostFocus )
                 std::cout << "LostFocus" << std::endl;
            else if( event.type == sf::Event::GainedFocus )
                 std::cout << "GainedFocus" << std::endl;
           
        }
       
        app.clear();
        app.display();
    }
    return 0;
}

// Gain focus event
case WM_SETFOCUS:
{
    Event event;
    event.type = Event::GainedFocus;
    pushEvent( event );
    break;
}

// Gain focus event
case WM_NCACTIVATE:
{
    if( wParam )
    {
        Event event;
        event.type = Event::GainedFocus;
        pushEvent( event );
    }
    break;
}

//void WindowImplWin32::setPosition(const Vector2i& position)
void setWindowPositionWin32( const sf::Vector2i & position, const sf::Window & window )
{
    sf::WindowHandle m_handle = window.getSystemHandle();
   
    // - SWP_NOZORDER, + SWP_NOACTIVATE
    SetWindowPos( m_handle, NULL, position.x, position.y, 0, 0, SWP_NOSIZE | SWP_NOACTIVATE );
}

//void WindowImplWin32::setSize(const Vector2u& size)
void setWindowSizeWin32( const sf::Vector2u & size, const sf::Window & window )
{
    sf::WindowHandle m_handle = window.getSystemHandle();
   
    // SetWindowPos wants the total size of the window (including title bar and borders),
    // so we have to compute it
   
    RECT rectangle = { 0, 0, static_cast < long >( size.x ), static_cast < long >( size.y ) };
    AdjustWindowRect( & rectangle, GetWindowLong( m_handle, GWL_STYLE ), false );
    int width = rectangle.right - rectangle.left;
    int height = rectangle.bottom - rectangle.top;
    // - SWP_NOZORDER, + SWP_NOACTIVATE
    SetWindowPos( m_handle, NULL, 0, 0, width, height, SWP_NOMOVE | SWP_NOACTIVATE );
}