This solves two problems: * UIDartState was being deleted during destruction of DartController after the isolate had been shut down. The UIDartState held persistent handles to Dart objects, and deleting them when the isolate no longer exists caused an assertion failure. * DartStates created for secondary isolates were never being deleted Fixes https://github.com/flutter/flutter/issues/2549
Flutter Engine
Flutter is a new way to build high-performance, cross-platform mobile apps. Flutter is optimized for today's, and tomorrow's, mobile devices. We are focused on low-latency input and high frame rates on Android and iOS.
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For information about contributing code to the engine itself, please see CONTRIBUTING.md.
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