Nullability of reference types in type of parameter 'data' of 'bool ViewLocator.Match(object data)' doesn't match implicitly implemented member 'bool IDataTemplate.Match(object? data)' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'data' of 'Control ViewLocator.Build(object data)' doesn't match implicitly implemented member 'Control? ITemplate<object?, Control?>.Build(object? param)' (possibly because of nullability attributes).

Cannot convert null literal to non-nullable reference type.

Possible null reference argument for parameter 'item' in 'void List<string>.Add(string item)'.

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

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

Possible null reference return.

Possible null reference return.

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