Set the transient hint only on the first shown dialog, not on all of them.

E.g. the file open dialog can shown another dialog for creating
a directory, and that one has to be transient for the file open dialog.

svn path=/trunk/kdebase/kdialog/; revision=263404

kdialog/kdialog.cpp

@@ -114,6 +114,7 @@ bool WinIdEmbedder::eventFilter(QObject *o, QEvent *e)
         if (id)
             XSetTransientForHint(w->x11Display(), w->winId(), id);
 #endif
+        delete this; // delete - set the transient hint only on the first dialog
     }
     return QObject::eventFilter(o, e);
 }