Content is not properly drawn when using ViewArrangement.Fixed

[swftq]

Describe the bug
When explicitly setting the Arrangement.Fixed property, the window content is not properly drawn. This issue becomes noticeable when interacting with modals or draggable elements within the window.

To Reproduce
Steps to reproduce the behavior:

1. Set Window's Arrangement to ViewArrangement.Fixed;
2. Add a button
3. Open a MessageBox.Query on the button click
4. Move the modal around and see the bug

Screenshots

Expected behavior

Desktop:

• OS: Window
• Version: 10

Code

internal class MainWindow : Window
{
    public MainWindow()
    {
        this.Width = Dim.Fill();
        this.Height = Dim.Fill();
        this.Arrangement = ViewArrangement.Fixed;
        var button = new Button()
        {
            Text = "Click me",
            X = Pos.Center(),
            Y = Pos.Center()
        };
        button.Accepting += (sender, e) =>
        {
            MessageBox.Query("Accepted", "You clicked the button", "Ok");
        };
        Add(button);
    }
}

[tig]

This will be fixed soon!

I'm working on a pr now for this and other things.