Jani, perhaps that is not your task, but maybe you have an idea where that could go wrong?

I have a declarative scene with an image and applied half opacity. That looks as expected on XM5800 (raster) with Qt 4.7.1. But on 4.7.2, the blending goes wrong. On Windows everything is fine with raster and Qt 4.7.2. So, this is Symbian specific.

The attached screenshot shows copies of a black/white image which gradually have less opacity. On the left it looks good. On the right (4.7.2), you see that the black part does immediately disappear in the second copy of the image, while the white part seems to stay opaque till nearly the last copy.

My naive guesses are: Wrong composition mode? Something with premultiplied Alpha? Perhaps something relevant in the native pixmap backend changed?