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

Non-nullable field 'tappedCommand' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Dereference of a possibly null reference.

Nullability of reference types in type of parameter 'sender' of 'void BorderlessEditor.ExtendableEditor_TextChanged(object sender, TextChangedEventArgs e)' doesn't match the target delegate 'EventHandler<TextChangedEventArgs>' (possibly because of nullability attributes).

Non-nullable field 'tappedCommand' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Dereference of a possibly null reference.

Nullability of reference types in type of parameter 'sender' of 'void BorderlessEditor.ExtendableEditor_TextChanged(object sender, TextChangedEventArgs e)' doesn't match the target delegate 'EventHandler<TextChangedEventArgs>' (possibly because of nullability attributes).

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

Non-nullable field 'tappedCommand' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.