171221580e8f73ddc814db50988aa69a051060a3
Some embedders use a custom platform task runner that does not support fml::MessageLoopTaskQueues and may not have an fml::MessageLoop. To support those embedders, DartIsolate::SetMessageHandlingTaskRunner will not use fml::MessageLoopTaskQueues for platform isolates. See https://github.com/flutter/engine/pull/48551#issuecomment-1962190896
Post Dart message handling tasks directly to the platform task runner for isolates running on the platform thread (flutter/engine#51573)
Description
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