Warn that calling virtuals in a base constructor won't have the intended effect

svn path=/trunk/KDE/kdebase/workspace/libs/plasma/; revision=677452

dataengine.cpp

@@ -118,6 +118,7 @@ DataEngine::DataEngine(QObject* parent)
 {
     connect(d->updateTimer, SIGNAL(timeout()), this, SLOT(checkForUpdates()));
     //FIXME: we should delay this call; to when is the question.
+    //Update DataEngine::init() api docu when fixed
     init();
 }
 

dataengine.h

@@ -174,6 +174,8 @@ class PLASMA_EXPORT DataEngine : public QObject
          * method is called the DataEngine is fully constructed and ready to be
          * used. This method should be reimplemented by DataEngine subclasses
          * which have the need to perform a startup routine.
+         *
+         * NOTE: Due to a bug in the DataEngine base implementation this method is never called.
          **/
         virtual void init();