The buttons in the text selection toolbar bounce on desktop

[justinmc]

On desktop, the buttons in the text selection toolbar have some small vertical movement after they appear. Notice the downward movement of the buttons in the gif below as I move my mouse.

Steps to reproduce

1. Run any app with text that can be selected, such as the one given below with a TextField, on desktop.
2. Right click to show the toolbar.
3. Wait a bit, maybe move the mouse.

Expected: The toolbar buttons stay in place and don't move.
Actual: The toolbar buttons move vertically by a pixel or two.

Example app

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}
class MyHomePage extends StatelessWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            TextField(),
          ],
        ),
      ),
    );
  }
}

[TahaTesser]

I'm unable to reproduce on the latest master channel on the macOS desktop.

Screen.Recording.2022-07-20.at.17.35.22.mov

Code Sample

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({super.key, this.dark = false, this.useMaterial3 = true});

  final bool dark;
  final bool useMaterial3;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      themeMode: dark ? ThemeMode.dark : ThemeMode.light,
      theme: ThemeData(
        useMaterial3: useMaterial3,
        brightness: Brightness.light,
        colorSchemeSeed: const Color(0xff6750a4),
      ),
      darkTheme: ThemeData(
        useMaterial3: useMaterial3,
        brightness: Brightness.dark,
        colorSchemeSeed: const Color(0xff6750a4),
      ),
      home: const Example(),
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('TextField'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            TextField(
              controller: TextEditingController(
                  text:
                      'Flutter Flutter Flutter Flutter Flutter Flutter Flutter Flutter Flutter Flutter'),
              style: const TextStyle(fontSize: 34.0),
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {},
        child: const Icon(Icons.add),
      ),
    );
  }
}

[gspencergoog]

Justin, where did you reproduce this? It looks like it's drawing a different menu from the one that Taha shows. (Desktop Triage)

[justinmc]

Sorry, this was on Linux! I just tried it again and I still see it on Linux, using a physical mouse. I tried on Mac and did not see it, using a trackpad. Not sure if that has anything to do with it. It seems strange that the platform would affect this.

[jpnurmi]

This is caused by fractional translation. It's not 100% deterministic but relatively easy to reproduce with popups and dialogs and device pixel ratio 1.

fractional.mp4

[tgucio]

Likely same as #107921 (seen on Windows, also with dialogs, Chips etc.)