I think this actually depends on the widget style (in this case Oxygen). Anyway, please report a wish at http://bugs.kde.org if you want this to be changed. Such a change should really be done for KDE rather than Kubuntu-only, therefore I am marking as Won't Fix.
** Changed in: kdebase-kde4 (Ubuntu) Status: New => Won't Fix -- konqueror-4.{0,1} ui regression https://bugs.launchpad.net/bugs/254039 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs