GestureDetector defers onTap to next screen tap #41233
Description
So basically if you tap GestureDetector, it will defer its events until the next event is fired. This is a very serious regression unless I'm misunderstanding something.
Here's a little rx style marble diagram:
input: 1-2-3-4-5-6
expected: 1-2-3-4-5-6
actual: --1-2-3-4-5
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel dev, v1.10.5, on Mac OS X 10.14.6 18G87, locale en-US)
[✓] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
[✓] Xcode - develop for iOS and macOS (Xcode 11.0)
[✓] Android Studio (version 3.1)
[✓] VS Code (version 1.38.1)
[✓] Connected device (1 available)
• No issues found!
import 'package:flutter/material.dart';
void main() {
runApp(_MyApp());
}
class _MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Material(
child: Row(
children: [1, 2, 3].map(
(value) {
/// 1. Tap once on any of these
/// 2. Observe that no print statement occurs
/// 3. Tap anywhere on the screen
/// 4. Observe that the previously expected print statement occurs
///
/// TLDR: print statements are delayed one tap, even if the
/// last tap is not on any of these GestureDetectors
return GestureDetector(
onTap: () => print(value),
child: Container(
color: Colors.red.shade100,
margin: EdgeInsets.all(8),
alignment: Alignment.center,
child: Text(value.toString()),
width: 60,
),
);
},
).toList(),
),
),
);
}
}