[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
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