userUpdateTextEditingValue method Null safety
Indicates that the user has requested the delegate to replace its current
text editing state with
value is treated as user input and thus may subject to input
- EditableTextState.userUpdateTextEditingValue: an implementation that
applies additional pre-processing to the specified
value, before updating the text editing state.
void userUpdateTextEditingValue(TextEditingValue value, SelectionChangedCause cause);