hide and unhide the icon when its action visibility changes (no more

ghost lockers with zoomed out desktop:)

svn path=/trunk/KDE/kdelibs/; revision=892159

widgets/iconwidget.cpp

@@ -1209,6 +1209,7 @@ void IconWidgetPrivate::syncToAction()
     q->setIcon(action->icon());
     q->setText(action->iconText());
     q->setEnabled(action->isEnabled());
+    q->setVisible(action->isVisible());
     //TODO use action's tooltip too
 
     emit q->changed();