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Bug
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Resolution: Won't Do
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Not Evaluated
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None
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5.12.9, 5.15.0
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None
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Tested on MacOS 10.14.6, Qt 5.9.9, 5.12.9, and 5.15.0.
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All
In Qt 5.9 it was possible to call QDataStream::skipRawData with a negative offset to move backwards through a file, but in Qt 5.12 and 5.15 it gives an error "QIODevice::skip (QBuffer): Called with maxSize < 0" instead.
It looks like internally it was changed (for non-sequential devices) to use QIODevice::skip() instead of seek(), which doesn't allow negative values.