Argument of type 'AvaloniaPropertyChangedEventArgs<ObservableCollection<string>>' cannot be used for parameter 'args' of type 'AvaloniaPropertyChangedEventArgs<ObservableCollection<string>?>' in 'void ControlClassesInput.OnClassesChanged(AvaloniaPropertyChangedEventArgs<ObservableCollection<string>?> args)' due to differences in the nullability of reference types.

Non-nullable field '_targetClasses' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.

Dereference of a possibly null reference.

Non-nullable field '_items' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

Non-nullable field '_internalText' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.

Converting null literal or possible null value to non-nullable type.

Dereference of a possibly null reference.

The field 'NavMenuItem._popupPanel' is never used

The field 'RangeTrack._lastDrag' is never used