Version:            (using KDE Devel)
Installed from:    Compiled sources
Compiler:          gcc 4.2.2. 
OS:                Linux

As the title says the setTabTextColor isn't painted with Oxygen style, Plastic works

Below is qt app that shows the bug. I'll post screenshots too.

#include <QtCore>
#include <QtGui>

int main(int argc, char *argv[])
{
        QApplication app(argc, argv);

        QTabBar edit;
        edit.addTab("xxx");
        edit.addTab("yy");
        edit.setTabTextColor(0, Qt::red);
        edit.show();
        return app.exec();
}