I like that the QProgressBar can become a busy indicator when both min and max are set to 0. However, I'd go wonkers if I ever needed to add a busy indicator with Designer, because it also moves in there. It's very distracting, to say the least. (I know, I could set the max to 1 or something, and then set it to 0 by code. But that wouldn't be very elegant, would it?)

Not really a problem as such. Just an observation. Maybe the Trolls should disable the animation in Designer.