public void NoZeroOffset()
{
var p = new ScrollPanel(LayoutTestStyle.Create())
{
// CornerSize = 10,
Padding = new Insets(10),
VerticalScrollbarMode = ScrollbarMode.Always,
Content = LayoutTestWidget.FixedSize(500, 300)
};
// first arrange to initialize all sizes
p.Arrange(new Rectangle(10, 20, 500, 200));
// scroll down
p.Scrollbar.ScrollToBottom(true);
// second arrange should have moved the child ..
p.Arrange(new Rectangle(10, 20, 500, 200));
p.Scrollbar.ScrollContentHeight.Should().Be(300);
p.Scrollbar.ScrollContentOrigin.Should().Be(-90);
p.Content.LayoutRect.Should().Be(new Rectangle(20, -90, 480, 300));
p.ContentRect.Bottom.Should().Be(p.Content.LayoutRect.Bottom);
}