Menu appears in wrong place when opened in a subview

[tznind]

Describe the bug
Opens in wrong place

To Reproduce

1. Have a Toplevel
2. Add a Window with some width/height sizing (like a Dialog has)
3. Add a MenuBar
4. Open Menu Bar

Here is some code to repro

        Application.Init ();

        var t = new Toplevel ();

        var w = new Window ();
        var menuBar = new Terminal.Gui.MenuBar ();
        w.Width = Dim.Percent (90);
        w.Height = Dim.Percent (80);
        w.X = Pos.Center ();
        w.Y = Pos.Center ();
        menuBar.Width = Dim.Fill (0);
        menuBar.Height = 1;
        menuBar.X = 0;
        menuBar.Y = 0;
        menuBar.Visible = true;
        menuBar.Arrangement = Terminal.Gui.ViewArrangement.Fixed;
        menuBar.CanFocus = false;
        menuBar.ShadowStyle = Terminal.Gui.ShadowStyle.None;
        menuBar.Data = "menuBar";
        menuBar.TextAlignment = Terminal.Gui.Alignment.Start;
        var fileF9Menu = new Terminal.Gui.MenuBarItem ();
        fileF9Menu.Title = "_File (F9)";
        var editMeMenuItem = new Terminal.Gui.MenuItem ();
        editMeMenuItem.Title = "Edit Me";
        editMeMenuItem.Data = "editMeMenuItem";
        fileF9Menu.Children = new Terminal.Gui.MenuItem [] {
        editMeMenuItem};
        menuBar.Menus = new Terminal.Gui.MenuBarItem [] {
        fileF9Menu};
        w.Add (menuBar);

        t.Add (w);
        Application.Run (t);
        Application.Shutdown ();

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots

[tig]

I wouldn't waste any time on this.

This will be fixed, properly, in

• Modernize Menu - Base on Bar and address litany of issues #2975

Menu was never intended to be used like this.