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Fix application crashes when page with QZXing closes #237

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@dedkovd dedkovd commented May 5, 2023

Sometimes, when page with active scanner closes, QZXingFilter is still processing frame but that frame has already been removed with QVideoSink. So, application may be crashed. Qt::QueuedConnection fixes this problem.

Sometimes, when page with active scanner closes, QZXingFilter is still
processing frame but that frame has already been removed with QVideoSink.
So, application may be crashed. Qt::QueuedConnection fixes this problem.
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