ChipsInputState missing performSelector override

[noworyta]

Error: The non-abstract class 'ChipsInputState' is missing implementations for these members:
../…/src/chips_input.dart:87
- TextInputClient.performSelector
Try to either
- provide an implementation,
- inherit an implementation from a superclass or mixin,
- mark the class as abstract, or
- provide a 'noSuchMethod' implementation.
class ChipsInputState extends State<ChipsInput>
^^^^^^^^^^^^^^^