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由 Jason Simmons 提交于
Keep a copy of each engine's description that can be accessed outside the engine's UI thread (#6885) The service protocol's ListViews method needs to return description data for each engine in the process. Previously ListViews would queue a task to each UI thread to gather this data. However, the UI thread might be blocked from executing tasks (e.g. if the Dart isolate is paused), resulting in a deadlock. This change provides a copy of the engine's description data to the ServiceProtocol's global list of engines, allowing ListViews to run without accessing any UI threads. Fixes https://github.com/flutter/flutter/issues/24400
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