[Development] QImage::transformed returns shallow copy for QTransform::TxNone matrix type.

[Tomasz Olszak]

Hello,

QImage:: transformed(const QTransform &matrix, Qt::TransformationMode mode
= Qt::FastTransformation) docs:

"Returns a copy of the image that is transformed using the given
transformation matrix and transformation mode."

But if matrix.type() == QTransform::TxNone then shallow instead of deep
copy is returned.

I'm happy to submit a fix but I don't know what is expected behaviour?
Should implementation follow docs or docs or docs follow implementation
here?

T.
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