CVS commit by buis: 

Frauke noticed this problem, I came up with this solution, okayed by tronical.


  M +1 -0      kactionclasses.cpp   1.314


--- kdelibs/kdeui/kactionclasses.cpp  #1.313:1.314
@@ -662,4 +662,5 @@ int KSelectAction::plug( QWidget *widget
       }
       cb->setInsertionPolicy( QComboBox::NoInsertion );
+      QWhatsThis::add( cb, whatsThis() );
     }