Version: (using Devel)
Installed from: Compiled sources
The playlist's are forced to have transparent backgrounds, although only the viewport needs to be transparent. After looking at the code I came to the conclusion that it's the same bug as here: https://bugs.kde.org/show_bug.cgi?id=173546.
Created attachment 28146 [details]
This is how a patch could look like, but I never tested it...
SVN commit 875935 by seb:
Fix playlist scrollbar graphical errors with some styles. We only need to set the viewport transparent.
Patch by Huynh Huu Long
M +2 -0 ChangeLog
M +9 -6 src/playlist/view/listview/PrettyListView.cpp
WebSVN link: http://websvn.kde.org/?view=rev&revision=875935