textEditingController property Null safety
The TextEditingController that is used for the text field.
The main purpose of this parameter is to allow the use of a separate text field located in another part of the widget tree instead of the text field built by fieldViewBuilder. For example, it may be desirable to place the text field in the AppBar and the options below in the main body.
When following this pattern, fieldViewBuilder can return
SizedBox.shrink() so that nothing is drawn where the text field would
normally be. A separate text field can be created elsewhere, and a
FocusNode and TextEditingController can be passed both to that text field
and to RawAutocomplete.
flutter create --sample=widgets.RawAutocomplete.focusNode.1 mysample
If this parameter is not null, then focusNode must also be not null.
final TextEditingController? textEditingController;