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This would be a breaking change, so for now it is disabled, but the method `applyPendingFileChanges()` can be added, and the clients will call it to be ready for the switching the flag. Only clients that call methods like `changeFile` have to await applying the file changes. Other clients can continue using synchronous `currentSession`. Change-Id: I0f8d4cc874f485776f611790f6c80fd7e07c8051 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/236041 Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Commit-Queue: Konstantin Shcheglov <scheglov@google.com>