Unexpected difference between ListView and FrameView

open System
open NStack
open Terminal.Gui

let ustr (str: string) = ustring.op_Implicit str

let createApplication() =
    Application.Init()

    let top = Application.Top

    let window = new Window(
        X = Pos.At 0,
        Y = Pos.At 0,
        Width = Dim.Fill(),
        Height = Dim.Fill()
    )

    // same settings
    let keysFrameView = new FrameView(ustr "Keys",
        X = Pos.Left window,
        Y = Pos.Bottom window,
        Width = Dim.Fill(),
        Height = Dim.Percent(50.f)
    )
    
    // same settings
    let keysListView = new ListView(
        X = Pos.Left window,
        Y = Pos.Bottom window,
        Width = Dim.Fill(),
        Height = Dim.Percent(50.f)
    )

    keysListView.SetSource([|
        for _ = 0 to 32 do
            ustr (Guid.NewGuid().ToString())
    |])

    window.Add keysListView //  works
    // window.Add keysFrameView // comment prev, uncomment this -> doesn't work

    top.Add window

    Application.Run top

createApplication()

When adding listView everything works as expected When adding frameView instead I get an exception (I modified it to show both edges instead of only one for clarity):

Unhandled exception. System.InvalidOperationException: TopologicalSort (for Pos/Dim) cannot find link from Window()({X=0,Y=0,Width=80,Height=1}) to FrameView()({X=0,Y=0,Width=0,Height=0}). Did you forget to add it to ContentView()({X=1,Y=1,Width=78,Height=0})? at Terminal.Gui.View.TopologicalSort(HashSet1 nodes, HashSet1 edges) in H:\source\repos\En3Tho\gui.cs\Terminal.Gui\Core\View.cs:line 1875 at Terminal.Gui.View.LayoutSubviews() in H:\source\repos\En3Tho\gui.cs\Terminal.Gui\Core\View.cs:line 2011 at Terminal.Gui.View.LayoutSubviews() in H:\source\repos\En3Tho\gui.cs\Terminal.Gui\Core\View.cs:line 2018 at Terminal.Gui.View.LayoutSubviews() in H:\source\repos\En3Tho\gui.cs\Terminal.Gui\Core\View.cs:line 2018 at Terminal.Gui.Application.Begin(Toplevel toplevel) in H:\source\repos\En3Tho\gui.cs\Terminal.Gui\Core\Application.cs:line 733 at Terminal.Gui.Application.Run(Toplevel view, Func`2 errorHandler) in H:\source\repos\En3Tho\gui.cs\Terminal.Gui\Core\Application.cs:line 1032 at Program.createApplication() in H:\source\repos\En3Tho\gui.cs\FSharpExample3\Program.fs:line 41 at <StartupCode$FSharpExample3>.$Program.main@() in H:\source\repos\En3Tho\gui.cs\FSharpExample3\Program.fs:line 43

Is there something I miss?

@tig @BDisp

[En3Tho]

@BDisp Neat 🙂. Thanks! Going to update my crutchy half-baked db picker 😃

[En3Tho]

@BDisp I see. Sorry for bothering with newbie questions. It looks like this now. Big thanks!