findChildIndexCallback returning negative values causes unusual error message #107123
Description
Steps to Reproduce
Create a SliverChildBuilderDelegate that has a findChildIndexCallback that returns -1:
SliverChildBuilderDelegate(
...,
findChildIndexCallback: (key) => -1),
Expected results:
Actual results:
════════ Exception caught by widgets library ═══════════════════════════════════
The following assertion was thrown building RawGestureDetector-[LabeledGlobalKey<RawGestureDetectorState>#644bc](state: RawGestureDetectorState#58dd7(gestures: <none>, behavior: opaque)):
'package:flutter/src/rendering/sliver_multi_box_adaptor.dart': Failed assertion: line 258 pos 16: 'child == null || indexOf(child) > index': is not true.
package:flutter/…/rendering/sliver_multi_box_adaptor.dart:258
2
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.md
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