Another ListView issue iOS: setting source causes crash if view was detached from visual tree.

(Latest Xamarin.Forms including hotfix)

I have a Contentview where the Contentview can have different subviews depending on the context (like a Tab view). One of the subviews has a listview.

That listview is updated regularly, but as soon as it did not have a parent anymore, I cannot update the Source anymore, it will crash. It will also crash if it is re-added to the visual tree.

I have reworked the code just to hide anything that does not need to be displayed instead of removing and readding it, and now it works again. So it is just for posterity this can cause trouble...

Unhandled Exception:
System.NullReferenceException: Object reference not set to an instance of an object
  at Xamarin.Forms.Platform.iOS.ListViewRenderer.UpdateItems (System.Collections.Specialized.NotifyCollectionChangedEventArgs e, Int32 section, Boolean resetWhenGrouped) [0x00000] in <filename unknown>:0 
  at Xamarin.Forms.Platform.iOS.ListViewRenderer.OnCollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00000] in <filename unknown>:0 
  at (wrapper delegate-invoke) <Module>:invoke_void__this___object_NotifyCollectionChangedEventArgs (object,System.Collections.Specialized.NotifyCollectionChangedEventArgs)
  at Xamarin.Forms.TemplatedItemsList`2[Xamarin.Forms.ItemsView`1[Xamarin.Forms.Cell],Xamarin.Forms.Cell].OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00000] in <filename unknown>:0 
  at Xamarin.Forms.TemplatedItemsList`2[Xamarin.Forms.ItemsView`1[Xamarin.Forms.Cell],Xamarin.Forms.Cell].OnProxyColl
ectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e, Boolean fixWindows) [0x00000] in <filename unknown>:0 
  at Xamarin.Forms.TemplatedItemsList`2[Xamarin.Forms.ItemsView`1[Xamarin.Forms.Cell],Xamarin.Forms.Cell].OnProxyCollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00000] in <filename unknown>:0 
  at Xamarin.Forms.TemplatedItemsList`2[Xamarin.Forms.ItemsView`1[Xamarin.Forms.Cell],Xamarin.Forms.Cell].OnItemsSourceChanged (Boolean fromGrouping) [0x00000] in <filename unknown>:0 
  at Xamarin.Forms.TemplatedItemsList`2[Xamarin.Forms.ItemsView`1[Xamarin.Forms.Cell],Xamarin.Forms.Cell].BindableOnPropertyChanged (System.Object sender, System.ComponentModel.PropertyChangedEventArgs e) [0x00000] in <filename unknown>:0 
  at (wrapper delegate-invoke) <Module>:invoke_void__this___object_PropertyChangedEventArgs (object,System.ComponentModel.PropertyChangedEventArgs)
  at (wrapper delegate-invoke) <Modu
le>:invoke_void__this___object_PropertyChangedEventArgs (object,System.ComponentModel.PropertyChangedEventArgs)
  at Xamarin.Forms.BindableObject.OnPropertyChanged (System.String propertyName) [0x00000] in <filename unknown>:0 
  at Xamarin.Forms.BindableObject.SetValueActual (Xamarin.Forms.BindableProperty property, System.Object value, Boolean currentlyApplying, Boolean clearBindings, Boolean raiseOnEqual) [0x00000] in <filename unknown>:0 
  at Xamarin.Forms.BindableObject.SetValueCore (Xamarin.Forms.BindableProperty property, System.Object value, Boolean clearBindings, Boolean raiseOnEqual, Boolean checkaccess) [0x00000] in <filename unknown>:0 
  at Xamarin.Forms.BindableObject.SetValue (Xamarin.Forms.BindableProperty property, System.Object value, Boolean checkaccess) [0x00000] in <filename unknown>:0 
  at Xamarin.Forms.BindableObject.SetValue (Xamarin.Forms.BindableProperty property, System.Object value) [0x00000] in <filename unknown>:0 
  at Xamarin.Forms.ItemsView`1[Xamarin.Forms.Cell].set_ItemsSou
rce (IEnumerable value) [0x00000] in <filename unknown>:0