[bug]: Setting autoFocus: true causes error

[pieterbergmans]

Describe the bug

I have a form with a TextFormField. When a user lands on the page that includes the form, I want the TextFormField to be active, so I set autoFocus: true. When I do that, it throws the following errors:

1. TextEditingController was used after being disposed
2. Another exception was thrown: Duplicate GlobalKey detected in widget tree

Has anyone encountered this issue? I have several other forms within my app and this is true for all of them. I have followed the excellent documentation here, so the code is boilerplate. The forms work fine when autoFocus: false.

══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY 

The following assertion was thrown building RawGestureDetector(state:
RawGestureDetectorState#955ba(gestures: [tap, long press, tap and pan], excludeFromSemantics: true,
behavior: translucent)):
A TextEditingController was used after being disposed.
Once you have called dispose() on a TextEditingController, it can no longer be used.

The relevant error-causing widget was:
  TextFormField
  TextFormField:file:///Users/pbergmans/Code/my_project/lib/ui/views/assistant/assistant_form.dart:34:13

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 296:3       throw_
packages/flutter/src/foundation/change_notifier.dart 179:9                        <fn>
packages/flutter/src/foundation/change_notifier.dart 185:14                       debugAssertNotDisposed
packages/flutter/src/foundation/change_notifier.dart 271:27                       addListener
packages/flutter/src/foundation/change_notifier.dart 499:14                       addListener
packages/flutter/src/widgets/transitions.dart 118:14                              didUpdateWidget
packages/flutter/src/widgets/framework.dart 5659:55                               update
packages/flutter/src/widgets/framework.dart 3827:14                               updateChild
packages/flutter/src/widgets/framework.dart 6776:14                               update
packages/flutter/src/widgets/framework.dart 3827:14                               updateChild
packages/flutter/src/widgets/framework.dart 5512:16                               performRebuild
packages/flutter/src/widgets/framework.dart 5650:11                               performRebuild
packages/flutter/src/widgets/framework.dart 5203:7                                rebuild
packages/flutter/src/widgets/framework.dart 5673:5                                update
packages/flutter/src/widgets/framework.dart 3827:14                               updateChild
packages/flutter/src/widgets/framework.dart 5512:16                               performRebuild
packages/flutter/src/widgets/framework.dart 5650:11                               performRebuild
packages/flutter/src/widgets/framework.dart 5203:7                                rebuild
packages/flutter/src/widgets/framework.dart 5673:5                                update
packages/flutter/src/widgets/framework.dart 3827:14                               updateChild
packages/flutter/src/widgets/framework.dart 6776:14                               update
packages/flutter/src/widgets/framework.dart 3827:14                               updateChild
packages/flutter/src/widgets/framework.dart 5512:16                               performRebuild
packages/flutter/src/widgets/framework.dart 5650:11                               performRebuild
packages/flutter/src/widgets/framework.dart 5203:7                                rebuild
packages/flutter/src/widgets/framework.dart 5673:5                                update
packages/flutter/src/widgets/framework.dart 3827:14                               updateChild
packages/flutter/src/widgets/framework.dart 6776:14                               update
packages/flutter/src/widgets/framework.dart 3827:14                               updateChild
packages/flutter/src/widgets/framework.dart 6776:14                               update
packages/flutter/src/widgets/framework.dart 3827:14                               updateChild
packages/flutter/src/widgets/framework.dart 6776:14                               update
packages/flutter/src/widgets/framework.dart 3827:14                               updateChild
packages/flutter/src/widgets/framework.dart 5512:16                               performRebuild
packages/flutter/src/widgets/framework.dart 5650:11                               performRebuild
packages/flutter/src/widgets/framework.dart 5203:7                                rebuild
packages/flutter/src/widgets/framework.dart 2905:18                               buildScope
packages/flutter/src/widgets/binding.dart 1136:9                                  drawFrame
packages/flutter/src/rendering/binding.dart 443:5                                 [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart 1392:7                                [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart 1313:9                                handleDrawFrame
packages/flutter/src/scheduler/binding.dart 1171:5                                [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1404:5                                invoke
lib/_engine/engine/platform_dispatcher.dart 307:5                                 invokeOnDrawFrame
lib/_engine/engine/initialization.dart 187:36                                     <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 426:37  _checkAndCall
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 431:39  dcall

══════════════════════════════════════════
2 Another exception was thrown: Assertion failed: file:///Users/pbergmans/Code/flutter/packages/flutter/lib/src/rendering/object.dart:3337:12
💡  ScaffoldViewModel | isUserSignedIn - yes
💡  MqttService | connect - trying...
Another exception was thrown: Duplicate GlobalKey detected in widget tree.

What operating system do you use?

macOS

Information about the installed tooling

No response

Steps to reproduce the issue

Create a form and set autoFocus: true

Expected behavior

I’d expect no errors.

Screenshots

No response

Additional Context

No response

[FilledStacks]

@pieterbergmans this is interesting.

I assume the autofocus is set on the InputTextField widget.

What's probably happening is that the auto focus is causing the bound value to be updated which is causing a rebuild, most likely during contruction of the ViewModel or while the widget tree is still being built.

IS there anything else in your code that causes a rebuild during that time?

Please post your form code and the viewModel code here.