https://bugs.kde.org/show_bug.cgi?id=338506

--- Comment #54 from Tuukka Verho <tuukka.ve...@aalto.fi> ---
(In reply to Tuukka Verho from comment #49)

> Setting sourceImage.size to the size of the screen may change the aspect
> ratio of the image. Qt handles this especially badly and I think there is a
> bug in Qt regarding that. However, there is no reason to change the aspect
> ratio back and forth. It's better to set just the width or the height of the
> source and let Qt keep the aspect ratio.

Actually the Qt documentation says the aspect ratio will be maintained
regardless of what the sourceSize is. So the patch should not be needed and
this must be a Qt bug, somehow Qt manages to mess up the scaling in some cases
when using sourceSize. I have submitted a report:
https://bugreports.qt.io/browse/QTBUG-57619

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