We’re seeing artifacts when the DropShadower is used with transformed components. Notice the black lines in the image below:
bump, also experiencing this.
Have you seen: Bug in DropShadow::drawForRectangle
I have! Seems similar, if not the same bug?
For my situation, I moved on and went with png dropshadows. The lines are noticiable, and my dropshadowed object has rounded rectangles, which DropShadower doesn’t account for (nudge nudge). Drawing shadow for path isn’t feasible either, due to my objects living in a viewport and repainting frequently.