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Adam Barth authored
This patch aligns the iteration patterns used by animations and ChangeNotifier. They now both respect re-entrant removal of listeners and coalesce duplication registrations. (Also, ChangeNotifier notification is no longer N^2). This patch introduces ObserverList to avoid the performance regression that the previous version of this patch caused. Fixes #7533
0f1d9775 
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| .. | ||
| animation.dart | ||
| animation_controller.dart | ||
| animations.dart | ||
| curves.dart | ||
| listener_helpers.dart | ||
| tween.dart |