Bug: NotifyCollectionChangedAction.Reset not cleaning up items

[minimalism]

ObservableCollection implements a Clear method that calls CollectionChanged callback with a NotifyCollectionChangedEventArgs where the action is NotifyCollectionChangedAction.Reset.
This case isn't implemented in ComboBox.Items_CollectionChanged, Menu.ItemsOnCollectionChanged or Grid.OnProportionsChanged (But probably should be, note how for example FileDialog.UpdateFolder calls _gridFiles.RowsProportions.Clear() in FileDialog.cs)
In MultipleItemsContainerBase.cs and Desktop.cs this case is implemented but due to how the ChildrenCopy property works, the removed items will not have their desktop and parent unset.

[rds1983]

Thanks for reporting.
I've fixed this case for Menu & ComboBox.
As for Grid.OnProportionsChanged, it calls InvalidateMeasure, which is enough. I dont think any additional processing in required there.

I'll look further into removed items not having Parent and Desktop unset.

[rds1983]

In MultipleItemsContainerBase.cs and Desktop.cs this case is implemented but due to how the ChildrenCopy property works, the removed items will not have their desktop and parent unset.

It works for me:

[Nornec]

I can confirm this is also happening with ListBox Items collections.