Scrollbar blank gap in QtCreator and Qt applications
I am working on a skin and I have a pretty nasty issue with QtCreator and any applications using the Qt framework. They are showing a quite nasty gap in the middle of scrollbars. With the theme I am working on the gap is 35px large, with other themes it gets a bit smaller. Here are a few examples of the issue:

The first one is the theme I am currently working on, the second and third themes are the "Corporate" and "Modern" themes included in WindowBlinds.
I have noticed the issue in my theme since long time ago, but I thought I missed some parts. Unfortunately, it's not, the issue happens with any theme I tried. Also, it happens in Qt compiled applications as well.
Before reporting this issue to Stardock I'd like to know if anyone else has the same issue either with QtCreator/Qt applications or with any other application, and if you have solved it somehow.
Thank you in advance.