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NSInternalInconsistencyException is thrown, fixed to run in main thread #193

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@sunuma sunuma commented Jun 16, 2023

Fatal Exception: NSInternalInconsistencyException
Modifications to the layout engine must not be performed from a background thread after it has been accessed from the main thread.

Updating AVCaptureVideoPreviewLayer may very rarely be done in a background thread when QRCodeReader is initialized.
It seems to be an issue related to #188

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