revert 803670, because a polished look is prioritized

svn path=/trunk/KDE/kdebase/workspace/; revision=831040

clients/oxygen/oxygenbutton.cpp

@@ -168,8 +168,6 @@ void OxygenButton::paintEvent(QPaintEvent *)
 
 //    widget->window()setPalette(pal);
 
-    helper_.renderWindowBackground(&painter, this->rect(), this, pal);
-
     if (type_ == ButtonMenu) {
         // we paint the mini icon (which is 16 pixels high)
         int dx = (width() - 16) / 2;

clients/oxygen/oxygenclient.cpp

@@ -90,6 +90,7 @@ void OxygenClient::init()
 
     widget()->setAutoFillBackground(false);
     widget()->setAttribute(Qt::WA_OpaquePaintEvent);
+    widget()->setAttribute(Qt::WA_PaintOnScreen, false); //TODO: remove this to save memory
 }
 
 bool OxygenClient::decorationBehaviour(DecorationBehaviour behaviour) const