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Okay, I linked an exemple and the font I use.
I see that this is caused by the line with the comment HERE, and when I remove the "*0.5f", the label get a good behavior...
(And I heard that my computer emit a noize when my exemple run, and the noize become more high-pitched when I decrease the size of the window... ^^')

I've a little issue when I resize my viewport. I explain: I allow the player of my game to resize the window, and my view should keep a 16:9 ratio. So I write a little fonction who resize the viewport when a window resizing event is thrown, and allow the view to be always in 16:9. The fonction return the float rect to assign to the viewport, and here is its code:

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FloatRect handleResize(Event::SizeEvent size)
{
    unsigned int iw = size.width;
    unsigned int ih = size.height;
    float fh(ih), fw(iw);//If size is in a 16:9 ratio, it won't change.
    if(iw/16 < ih/9)//Taller than a 16:9 ratio
        fh = iw * (9.0/16.0);
    else if(iw/16 > ih/9)//Larger than a 16:9 ratio
        fw = ih * (16.0/9.0);
    float scalex = fw/iw;
    float scaley = fh/ih;
    return FloatRect((1-scalex)/2.0f, (1-scaley)/2.0f, scalex, scaley);
}

But that make a litlle problem, the widget are strangely resized, like you can see inn the attached file, and that clip the content, here a label. The background of the label is grey in the picture. The proportions in the picture between the two windows are preserved. How can I fix that? Should I handle the resize in another way, or disable the resizing?
(Texus: I speak french at first, and I can see you're belgian, so can I speak with you in french?)

I suspected that there was a problem, but I couldn't see where  . And that worked because I just used some labels.
I'll look at the views, if I can do what I want with it my project will be much simpler!
Thank you for your fast reply

In my project I need to draw the gui with some render states, and I seen that that's no possible in TGUI v0.6.
So I changed a bit Gui.cpp, and now I can do stuff like this in my project:

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Transform transform;
transform.scale(Vector2f(scalingFactor, scalingFactor));
m_gui.draw(true, transform);

But I don't know if you purposely don't implemented this feature. Is that a good idea?
I attached the modified files.