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[BUG] Eccezione al ripristino delle impostazioni #18

Description

@mikyll

Descrivi il bug
Quando si ripristinano le impostazioni, mentre c'è un'animazione in corso, l'app spara un'eccezione (non dà problemi in Release, solo in debug).

Come riprodurre
Passaggi per riprodurre il bug:

  1. Avviare l'app in debug mode;
  2. Vai nella pagina delle Impostazioni (ViewSettings);
  3. Partendo dalle impostazioni di default;
  4. Deseleziona gli alert di conferma;
  5. Imposta il tema scuro;
  6. Ripristina le impostazioni;
  7. Eccezione sparata dall'AnimationController

Comportamento previsto
Nessuna eccezione.

Screenshot

Desktop:

  • SO: Windows
  • Versione: 1.10.0

Informazioni aggiuntive
Debug output:

════════ Exception caught by animation library ═════════════════════════════════
The following assertion was thrown while notifying status listeners for AnimationController:
'package:flutter/src/widgets/overlay.dart': Failed assertion: line 1392 pos 14: '_zOrderIndex != null': is not true.

Either the assertion indicates an error in the framework itself, or we should provide substantially more information in this error message to help you determine and fix the underlying cause.
In either case, please report this assertion by filing a bug on GitHub:
  https://github.com/flutter/flutter/issues/new?template=2_bug.yml

When the exception was thrown, this was the stack:
#2      OverlayPortalController.hide (package:flutter/src/widgets/overlay.dart:1392:14)
overlay.dart:1392
#3      TooltipState._handleStatusChanged (package:flutter/src/material/tooltip.dart:442:28)
tooltip.dart:442
#4      AnimationLocalStatusListenersMixin.notifyStatusListeners (package:flutter/src/animation/listener_helpers.dart:240:19)
listener_helpers.dart:240
#5      AnimationController._checkStatusChanged (package:flutter/src/animation/animation_controller.dart:815:7)
animation_controller.dart:815
#6      AnimationController._tick (package:flutter/src/animation/animation_controller.dart:831:5)
animation_controller.dart:831
#7      Ticker._tick (package:flutter/src/scheduler/ticker.dart:249:12)
ticker.dart:249
#8      SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1325:15)
binding.dart:1325
#9      SchedulerBinding.handleBeginFrame.<anonymous closure> (package:flutter/src/scheduler/binding.dart:1177:11)
binding.dart:1177
#10     _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:633:13)
compact_hash.dart:633
#11     SchedulerBinding.handleBeginFrame (package:flutter/src/scheduler/binding.dart:1175:17)
binding.dart:1175
#12     SchedulerBinding._handleBeginFrame (package:flutter/src/scheduler/binding.dart:1092:5)
binding.dart:1092
#13     _invoke1 (dart:ui/hooks.dart:328:13)
hooks.dart:328
#14     PlatformDispatcher._beginFrame (dart:ui/platform_dispatcher.dart:351:5)
platform_dispatcher.dart:351
#15     _beginFrame (dart:ui/hooks.dart:272:31)
hooks.dart:272
(elided 2 frames from class _AssertionError)

The AnimationController notifying status listeners was: AnimationController#7eab8(⏮ 0.000; paused)
════════════════════════════════════════════════════════════════════════════════

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