ListBox `SelectionMode`=`Multiple` no events

ListBox does not work properly when SelectionMode is set to Multiple.

Tested on Avalonia 0.9.2

Simple repro

type MainWindow() as this =
    inherit Window()
    do
        let listBox = new ListBox()
        listBox.SelectionMode <- SelectionMode.Multiple
        listBox.Items <- [
            "Item 1"
            "Item 2"
            "Item 3"
            "Item 4"
        ]
        
        listBox.SelectionChanged.Add(fun _ ->
            // only fired if a single item is selected. does not fire
            // for multiple selected items
            printfn "selection changed event"
        )
        
        listBox.GetSubject(ListBox.SelectedItemsProperty).Add(fun args ->
            // never fired when a selection changed
            printfn "subscription 'SelectedItemsProperty'"
        )
        
        base.Content <- listBox

[JaggerJo]

@FoggyFinder not exactly, ListBox.SelectedItemsProperty subscription also does not work

[Gillibald]

The current solution is better in scenarios where you transform the collection of selected items.