QGraphicsItem::ItemIgnoresTransformations and redrawing artifacts

[JeDi]

I'm sorry, I forgot to add this topic to my watch list and didn't see this reply...

I don't have any simple example code for now, but it is a scene with standard ellipse items with the ignore transforms option set. Because I used meters as my units, the scene is zoomed in a lot to fit on the screen (meters to pixels).

I am now using QT5, and because there pens are not cosmetic by default anymore (when using a width of 0) I had to convert all pens (mostly of reference lines I draw) to explicitly be cosmetic. There are no artifacts anymore, and they are also gone when I compile in QT 4.8.3.

So the artifacts were maybe not caused by the ellipses, but by the default pens I used, in combination with a large zoom factor?

Edit Actually, I just compiled with QT 4.8.1, and the artefacts are still present. They are completely gone in QT5 beta2 though.