visibility_detector

• Fix a bug for updates to render objects that have not been laid out yet.

• Re-apply Flutter framework bindings' null safety calls but set SDK constraints correctly to 2.12.0 instead.

• Reverts change from 0.3.0 where the Flutter version constraint should have been set to 2.12.0 instead of 2.10.5.

• Move to Flutter version 2.10.5 and update dependencies' null safety calls.

• Minor internal changes to maintain forward-compatibility with flutter#91753.

Update version to 0.2.0 and update CHANGELOG.md to mention
SliverVisibilityDetector.

PiperOrigin-RevId: 366835325

• Added SliverVisibilityDetector to report visibility of RenderSliver-based widgets. Fixes issue #174.

Revert the change to add
VisibilityDetectorController.scheduleNotification, which introduced
unexpected memory usage.

PiperOrigin-RevId: 353926906

• Revert change to add VisibilityDetectorController.scheduleNotification, which introduced unexpected memory usage.

• Use version 0.2.0-nullsafety.0 instead of 0.1.6-nullsafety to
  follow the recommendations from https://dart.dev/null-safety/migration-guide.
  (0.1.6-nullsafety was never published.)
• Remove the upper bound for the Flutter version constraint per
  https://dart.dev/go/flutter-upper-bound-deprecation.

PiperOrigin-RevId: 352980158

• Update to null safety.

• Try to fix the link to the example on pub.dev.

• Revert tests to again use RenderView instead of TestWindow.

• Add VisibilityDetectorController.scheduleNotification to force firing a visibility callback.

• Compatibility fixes to demo.dart for Flutter 1.13.8.

• Moved demo.dart to an examples/ directory, renamed it, and added instructions to README.md.

• Adjusted tests to use TestWindow instead of RenderView.

• Added a "Known limitations" section to README.md.

• Style and comment adjustments.

• Fix a potential infinite loop in the demo app and add tests for it.