Error when using a `GlobalKey` inside a `CaptureWrapper`

[joseph-grabinger]

From @Vera-Spoettl in #62:

[✓] Flutter (Channel stable, 3.22.3, on macOS 14.5 23F79 darwin-arm64, locale de-DE) [✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0) [✓] Xcode - develop for iOS and macOS (Xcode 15.4) [✓] Chrome - develop for the web [✓] Android Studio (version 2023.1) [✓] VS Code (version 1.91.1) [✓] Connected device (4 available) [✓] Network resources

• No issues found!

When I give a GlobalKey to a captured widget, I get the following error during runtime:

════════ Exception caught by widgets library ═══════════════════════════════════
The following assertion was thrown building CaptureWrapper-[<'someFrame'>]:
'package:flutter/src/widgets/framework.dart': Failed assertion: line 2116 pos 12: '_elements.contains(element)': 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

The relevant error-causing widget was: CaptureWrapper-[<'someFrame'>] CaptureWrapper:file:///Users/vsz/Development/projects/stuff/report_generator/lib/main.dart:31:15

════════ Exception caught by widgets library ═══════════════════════════════════ Duplicate GlobalKey detected in widget tree. ════════════════════════════════════════════════════════════════════════════════

[joseph-grabinger]

Adjusted the package's example in #82 so we have a common ground to speak about the same example/code-base @Vera-Spoettl.

[Vera-Spoettl]

@joseph-grabinger I'll start to investigate next weekend ...

[joseph-grabinger]

Internal Note: A workaround to this issue is to define the GlobalKey inside the CaptureWrapper's scope.