Don't pass the button index to popup() for the GtkMenu to avoid strange GTK behaviour in newer versions. Identified by coling

git-svn-id: file:///home/lennart/svn/public/pavucontrol/trunk@58 c17c95f2-f111-0410-90bf-f30a9569010c

src/pavucontrol.cc

@@ -478,7 +478,7 @@ bool SinkInputWidget::on_button_press_event(GdkEventButton* event) {
     if (event->type == GDK_BUTTON_PRESS && event->button == 3) {
         clearMenu();
         buildMenu();
-        menu.popup(event->button, event->time);
+        menu.popup(0, event->time);
         return TRUE;
     }