Replacing TabController mid-animation throws exception #34744
Description
When trying to dynamically update the number of tabs with a new TabController, an exception is thrown because the animation library attempts to reach an AnimationController that is no longer available.
Steps to Reproduce
Here's a gist with reproducible sample.
- Get the TabBarView or TabBar mid-animation
- Add/Remove tab while mid-animation
Logs
I/flutter ( 4483): #12 ScrollPositionWithSingleContext.setPixels
package:flutter/…/widgets/scroll_position_with_single_context.dart:83
I/flutter ( 4483): #13 BallisticScrollActivity.applyMoveTo
package:flutter/…/widgets/scroll_activity.dart:547
I/flutter ( 4483): #14 BallisticScrollActivity._tick
package:flutter/…/widgets/scroll_activity.dart:534
I/flutter ( 4483): #15 _AnimationController&Animation&AnimationEagerListenerMixin&AnimationLocalListenersMixin.notifyListeners
package:flutter/…/animation/listener_helpers.dart:124
I/flutter ( 4483): #16 AnimationController._tick
package:flutter/…/animation/animation_controller.dart:765
I/flutter ( 4483): #17 Ticker._tick
package:flutter/…/scheduler/ticker.dart:228
I/flutter ( 4483): #18 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._invokeFrameCallback
package:flutter/…/scheduler/binding.dart:1016
I/flutter ( 4483): #19 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.handleBeginFrame.<anonymous closure>
package:flutter/…/scheduler/binding.dart:934
I/flutter ( 4483): #20 __InternalLinkedHashMap&_HashVMBase&MapMixin&_LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:367:8)
I/flutter ( 4483): #21 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.handleBeginFrame
package:flutter/…/scheduler/binding.dart:932
I/flutter ( 4483): #22 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._handleBeginFrame
package:flutter/…/scheduler/binding.dart:866
I/flutter ( 4483): #26 _invoke1 (dart:ui/hooks.dart:250:10)
I/flutter ( 4483): #27 _beginFrame (dart:ui/hooks.dart:177:3)
I/flutter ( 4483): (elided 3 frames from package dart:async)
I/flutter ( 4483):
I/flutter ( 4483): The AnimationController notifying listeners was:
I/flutter ( 4483): AnimationController#a39b9(▶ 343.604; for BallisticScrollActivity)
I/flutter ( 4483): ════════════════════════════════════════════════════════════════════════════════════════════════════