Collection was modified after the enumerator was instantiated.

[evolcano]

Description

When I add a child to grid, it sometime trigger a error: Collection was modified after the enumerator was instantiated. This grid has none parent yet, grid and child is just created in this UI thread.

*CurrentNode is extended form StackLayout which has some hierarchy childs.

Steps to Reproduce

Can not repeat for have no regularity .

Link to public reproduction project repository

No response

Version with bug

8.0.70 SR7

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

Unknown/Other

Affected platforms

Windows

Affected platform versions

net8.0-windows10.0.19041.0

Did you find any workaround?

No

Relevant log output

System.InvalidOperationException
  HResult=0x80131509
  Message=Collection was modified after the enumerator was instantiated.
  Source=System.Linq
  StackTrace:
   at System.Linq.Enumerable.TryGetLast[TSource](IEnumerable`1 source, Boolean& found)
   at System.Linq.Enumerable.Last[TSource](IEnumerable`1 source)
   at Microsoft.Maui.Controls.SetterSpecificityList.GetSpecificityAndValue()
   at Microsoft.Maui.Controls.BindableObject.GetValue(BindableProperty property)
   at Microsoft.Maui.Controls.VisualElement.CoerceIsEnabledProperty(BindableObject bindable, Object value)
   at Microsoft.Maui.Controls.BindableObject.SetValueCore(BindableProperty property, Object value, SetValueFlags attributes, SetValuePrivateFlags privateAttributes, SetterSpecificity specificity)
   at Microsoft.Maui.Controls.BindableObjectExtensions.RefreshPropertyValue(BindableObject self, BindableProperty property, Object value)
   at Microsoft.Maui.Controls.VisualElement.Microsoft.Maui.Controls.IPropertyPropagationController.PropagatePropertyChanged(String propertyName)
   at Microsoft.Maui.Controls.Internals.PropertyPropagationExtensions.PropagatePropertyChanged(String propertyName, Element element, IEnumerable children)
   at Microsoft.Maui.Controls.NavigableElement.OnParentSet()
   at Microsoft.Maui.Controls.Element.SetParent(Element value)
   at Microsoft.Maui.Controls.Element.OnChildAdded(Element child)
   at Microsoft.Maui.Controls.VisualElement.OnChildAdded(Element child)
   at Microsoft.Maui.Controls.Layout.Add(IView child)
   at Microsoft.Maui.Controls.GridExtensions.AddWithSpan(Grid grid, IView view, Int32 row, Int32 column, Int32 rowSpan, Int32 columnSpan)

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• [Bug] Add items to the Grid after rendering the page. (#8025), similarity score: 0.71

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[PureWeen]

@StephaneDelcroix thoughts?

[StephaneDelcroix]

no thoughts, but easy to fix