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QGraphicsRotation and Scale are QObject wrappers. It's not useful in data structures where we're creating mulitple of these every frame. It's large enough to appear in hotspot as taking over 1% of a regular frame. We don't even use the QGraphicsRotation mapping inside scene for a reason, so it's not giving us much. It's technically an API break in libkwineffects. Pragamatically no-one would use these. We also lose QGraphicsScale's origin, but we never exposed this in PaintData's public header.
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