[Qt4-preview-feedback] Qt 4.5 RC1 Bugs with QGraphicsSvgItem rendering on Windows

[Laurent Gomila]

Hi

I've tested the new 4.5 RC1 for my SVG widgets project, and noticed a
few rendering bugs:
- Sometimes after zooming (scaling) the view, all the QGraphicsSvgItem
composing my widget are rendered black. The shape is ok but there's no
more color.
- Sometimes after scaling the view or items, I can see random noise in
the outline of some items. It looks like uninitialized pixels in
memory.

All these bugs are happening randomly. I've tried to use a QGLWidget
viewport, change the cache options, disable antialiasing, ... nothing
removes these bugs. Note that it was not happening with Qt 4.4.3.

My config: Windows XP SP3, nVidia GeForce 8500 GT, Intel quad core
8200, Qt 4.5 RC1 MinGW

I've included a screenshot showing the problem, as well as a simple
project which reproduces it (use mouse wheel to zoom in/out to
reproduce the bugs).

Thanks
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