Device notifier list corruption while hovering

[Ambroz Bizjak]

(continued discussion at http://bugs.kde.org/show_bug.cgi?id=167788)

Aaron J. Seigo wrote:
> i did test it (obviously), including on the desktop, and there was no
> corruption visible while testing when plugging and unplugging devices.
Have you ever noticed the corruption at all? I suspect it may not happen
on all systems.

Anyway, I'll look into QTreeView to understand what is going on there.
Fixing the actual bug would be much better than trying to work around it.
I'll first try different styles to see it's the style's fault.