flutter_keyboard_actions Why Column last widget move? dialog move delay

import 'package:flutter/material.dart';
import 'package:keyboard_actions/keyboard_actions.dart';

void main() => runApp(const MyApp());

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      title: 'Material App',
      home: TestWidget(),
    );
  }
}

class TestWidget extends StatelessWidget {
  const TestWidget({super.key});
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Column(
        children: [
          Expanded(
            child: ListView.builder(
              itemCount: 100,
              itemBuilder: (BuildContext context, int index) {
                return Text("data $index");
              },
            ),
          ),
          Container(
            padding: const EdgeInsets.all(20),
            height: 80,
            width: double.infinity,
            color: Colors.redAccent,
            child: GestureDetector(
              onTap: () => showWriteComment2(context),
              child: const Text("touch me. Why do I move ?"),
            ),
          ),
        ],
      ),
    );
  }
}

Future showWriteComment2(BuildContext context) async {
  var focusNode = FocusNode();
  focusNode.requestFocus();
  var controller = TextEditingController();
  return showDialog(
      context: context,
      builder: (context) {
        return GestureDetector(
            onTap: () => Navigator.pop(context),
            child: KeyboardActions(
              // isDialog: true,
              config: KeyboardActionsConfig(
                  keyboardActionsPlatform: KeyboardActionsPlatform.ALL,
                  actions: [
                    KeyboardActionsItem(
                      focusNode: focusNode,
                      displayActionBar: false,
                    ),
                  ]),
              child: Column(
                mainAxisSize: MainAxisSize.min,
                mainAxisAlignment: MainAxisAlignment.end,
                children: [
                  Container(
                    padding: const EdgeInsets.all(8),
                    color: Colors.white,
                    child: TextField(
                      controller: controller,
                      cursorColor: Colors.black,
                      decoration: const InputDecoration(
                        hintText: "Can you remove the delay in my popping up?",
                      ),
                      focusNode: focusNode,
                      maxLines: 7,
                    ),
                  ),
                  GestureDetector(
                    onTap: () {
                      Navigator.pop(context);
                    },
                    child: Container(
                      padding: const EdgeInsets.all(8),
                      color: Colors.amber,
                      width: double.infinity,
                      height: 40,
                      child: const Text("send"),
                    ),
                  )
                ],
              ),
            ));
      });
}