Children of SliverCrossAxisGroup report incorrect gestures' localPosition.

Steps to reproduce

Run the code sample
Tap on the 0 item (the local and global dx values are equal, and this is correct, as the item is the leftmost)
Tap on the left side of the 1 or 2 item (the local and global dx values are equal, which is incorrect; the local dx value has to have a value near 0)

Expected results

The local position of the gesture for each child of SliverCrossAxisGroup is correct.

Actual results

The local position of the gesture for each child of SliverCrossAxisGroup is incorrect.

Code sample

import 'package:flutter/material.dart';

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

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

  @override
  Widget build(BuildContext context) {
    Widget buildItem(int index) {
      return SliverToBoxAdapter(
        child: GestureDetector(
          behavior: HitTestBehavior.opaque,
          onTapDown: (TapDownDetails details) {
            print('[#$index item global] ${details.globalPosition}');
            print('[#$index item local] ${details.localPosition}');
            print('');
          },
          child: ColoredBox(
            color: Colors.blue[(index + 1) * 200]!,
            child: SizedBox(
              height: 100,
              child: Center(
                child: Text('$index'),
              ),
            ),
          ),
        ),
      );
    }

    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: const Text('SliverCrossAxisGroup')),
        body: CustomScrollView(
          slivers: <Widget>[
            SliverCrossAxisGroup(
              slivers: <Widget>[
                buildItem(0),
                buildItem(1),
                buildItem(2),
              ],
            ),
          ],
        ),
      ),
    );
  }
}

Screenshots or Video

Screenshots / Video demonstration

sliver_cross_axis_group_bug.mov

Flutter Doctor output

Doctor output

[✓] Flutter (Channel master, 3.35.0-1.0.pre-551, on macOS 15.6 24G84 darwin-arm64, locale en-US)
    [2.2s]
    • Flutter version 3.35.0-1.0.pre-551 on channel master at
      /Users/ksokolovskyi/development/flutter_master
    • Upstream repository [email protected]:ksokolovskyi/flutter.git
    • FLUTTER_GIT_URL = [email protected]:ksokolovskyi/flutter.git
    • Framework revision 47b253fdeb (10 hours ago), 2025-08-21 21:50:27 -0400
    • Engine revision 47b253fdeb
    • Dart version 3.10.0 (build 3.10.0-125.0.dev)
    • DevTools version 2.49.0
    • Feature flags: enable-web, enable-linux-desktop, enable-macos-desktop, enable-windows-desktop,
      enable-android, enable-ios, cli-animations, enable-native-assets, omit-legacy-version-file,
      enable-lldb-debugging

[✓] Android toolchain - develop for Android devices (Android SDK version 36.0.0) [2.9s]
    • Android SDK at /Users/ksokolovskyi/Library/Android/sdk
    • Emulator version 35.4.9.0 (build_id 13025442) (CL:N/A)
    • Platform android-36, build-tools 36.0.0
    • ANDROID_HOME = /Users/ksokolovskyi/Library/Android/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
      This is the JDK bundled with the latest Android Studio installation on this machine.
      To manually set the JDK path, use: `flutter config --jdk-dir="path/to/jdk"`.
    • Java version OpenJDK Runtime Environment (build 21.0.5+-13047016-b750.29)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 16.4) [964ms]
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 16F6
    • CocoaPods version 1.16.2

[✓] Chrome - develop for the web [5ms]
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Connected device (2 available) [6.1s]
    • macOS (desktop) • macos  • darwin-arm64   • macOS 15.6 24G84 darwin-arm64
    • Chrome (web)    • chrome • web-javascript • Google Chrome 139.0.7258.139

[✓] Network resources [1,752ms]
    • All expected network resources are available.

• No issues found!

Fix SliverMainAxisGroup and SliverCrossAxisGroup gestures' local posi…

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Fix SliverMainAxisGroup and SliverCrossAxisGroup gestures' local posi…

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Children of SliverCrossAxisGroup report incorrect gestures' localPosition. #174262

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Children of SliverCrossAxisGroup report incorrect gestures' localPosition. #174262

Description

Steps to reproduce

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Actual results

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Flutter Doctor output

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github-actions commented on Sep 10, 2025

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