Fix application crashes when page with QZXing closes #237
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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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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.