As you can see (ImageView.cs)
stc.RenderBackground(cr, 0, 0, allocation.Width, allocation.Height);
is currently commented out, why i have tried it and it works?

Also why is ther unreachable Code, is it needed?

`
protected override bool OnDrawn(Context cr)
{
var allocation = Allocation;
var stc = this.StyleContext;
//stc.RenderBackground(cr, 0, 0, allocation.Width, allocation.Height);

		if (Image is not { } image)
			return true;

		// HACK: Gtk sends sometimes a draw event while the widget reallocates.
		//       In that case we would draw in the wrong area, which may lead to artifacts
		//       if no other widget updates it. Alternative: we could clip the
		//       allocation bounds, but this may have other issues.
		if (allocation.Width == 1 && allocation.Height == 1 && allocation.X == -1 && allocation.Y == -1) // the allocation coordinates on reallocation
			return base.OnDrawn(cr);


		var imgSize = Measure(Aspect, new Size(image.Width, image.Height), allocation.Width, allocation.Height);
		var x = (allocation.Width - imgSize.Width) / 2;
		var y = (allocation.Height - imgSize.Height) / 2;

		if (false)

#pragma warning disable CS0162 // Unreachable code detected
{
using var region = Window.VisibleRegion;
using var frame = Window.BeginDrawFrame(region);
using var crr = frame.CairoContext;
crr.DrawPixbuf(image, x, y, allocation.Width, allocation.Height);
Window.EndDrawFrame(frame);
}
#pragma warning restore CS0162 // Unreachable code detected
else
{
cr.DrawPixbuf(image, x, y, imgSize.Width, imgSize.Height);
}

		return false;
	}

`