As the link of comment 3 is no longer available, I searched for e new workaround. For me deactivating "Apply colours to non-QT applications" in System settings -> Colour -> Options fixes the issue in KDE plasma 5.7.5. Maybe this should be deactivated by default?
As the link of comment 3 is no longer available, I searched for e new workaround. For me deactivating "Apply colours to non-QT applications" in System settings -> Colour -> Options fixes the issue in KDE plasma 5.7.5. Maybe this should be deactivated by default?