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[TabBar] Setting isScrollable in TabBar to true causes exception when navigating between pages #44269
Description
Steps to reproduce
(this is on the master branch of flutter)
-
Create an app with a start page and a main page with a TabBar that has isScrollable set to true (see this gist: https://gist.github.com/perclasson/912d072cdb9cd17e0fb837d9afe0b309).
-
Go from the start page (by clicking on the button) and you will get an exception on the tab bar page.
Logs
[VERBOSE-2:ui_dart_state.cc(157)] Unhandled Exception: 'package:flutter/src/widgets/scroll_position.dart': Failed assertion: line 696 pos 12: 'pixels != null': is not true.
#0 _AssertionError._doThrowNew (dart:core-patch/errors_patch.dart:40:39)
#1 _AssertionError._throwNew (dart:core-patch/errors_patch.dart:36:5)
#2 ScrollPosition.dispose (package:flutter/src/widgets/scroll_position.dart:696:12)
#3 ScrollPositionWithSingleContext.dispose (package:flutter/src/widgets/scroll_position_with_single_context.dart:256:11)
#4 _rootRun (dart:async/zone.dart:1120:38)
#5 _CustomZone.run (dart:async/zone.dart:1021:19)
#6 _CustomZone.runGuarded (dart:async/zone.dart:923:7)
#7 _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:963:23)
#8 _rootRun (dart:async/zone.dart:1124:13)
#9 _CustomZone.run (dart:async/zone.dart:1021:19)
#10 _CustomZone.runGuarded (dart:async/zone.dart:923:7)
#11 _CustomZone.bindCallbackGuarded.<anonymous closure<…>
Flutter Doctor
[✓] Flutter (Channel master, v1.10.1-pre.867, on Mac OS X 10.14.6 18G95, locale en-DE)
• Flutter version 1.10.1-pre.867 at /Users/perc/development/flutter
• Framework revision 289b4588f4 (6 hours ago), 2019-11-06 02:51:17 -0500
• Engine revision 9726b4cb99
• Dart version 2.7.0
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
• Android SDK at /Users/perc/Library/Android/sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-stable, build-tools 29.0.2
• Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)
• All Android licenses accepted.
[✓] Xcode - develop for iOS and macOS (Xcode 11.0)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 11.0, Build version 11A420a
• CocoaPods version 1.7.5
[✓] Chrome - develop for the web
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[✓] Android Studio (version 3.5)
• Android Studio at /Applications/Android Studio with Blaze.app/Contents
• Flutter plugin version 40.2.2
• Dart plugin version 191.8593
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)
[✓] Android Studio (version 3.5)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin version 40.2.2
• Dart plugin version 191.8593
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)
[!] VS Code (version 1.39.2)
• VS Code at /Applications/Visual Studio Code.app/Contents
✗ Flutter extension not installed; install from
https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter
[✓] Connected device (4 available)
• iPhone 11 Pro Max • 787077DE-9BAA-449A-B911-80F95A3FCD2A • ios • com.apple.CoreSimulator.SimRuntime.iOS-13-0 (simulator)
• macOS • macOS • darwin-x64 • Mac OS X 10.14.6 18G95
• Chrome • chrome • web-javascript • Google Chrome 78.0.3904.87
• Web Server • web-server • web-javascript • Flutter Tools
Activity
perclasson commentedon Nov 6, 2019
After running
git bisectit seems as if this is caused by #43756. When I revert that commit it no longer gives me an exception.perclasson commentedon Nov 6, 2019
cc @goderbauer
github-actions commentedon Aug 25, 2021
This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of
flutter doctor -vand a minimal reproduction of the issue.