Plastik uses the button background and window foreground for tabs and scrollbar buttons. I was expecting it to use button background and foreground for scrollbar buttons and either window or button background and foreground for tabs. As it is right now, some color schemes (like the one pictured) can cause it to look rather ugly. Reproducible: Always Steps to Reproduce: 1. Set button background and foreground and window background and foreground to distinct colors. 2. Apply the changes and pay attention to tabs and scroll bar buttons. Actual Results: - Expected Results: - -
Plastique is a style offered by Qt. I doubt this is a bug, but you could report it to Qt developers via https://bugreports.qt-project.org/
I tested with CheckColorRoles color theme, and indeed Plastique uses wrong color roles. If you report it, please add the link here.
Reported: https://bugreports.qt-project.org/browse/QTBUG-30693