question: public void removeSelectionChangeListener ( final SelectionChangeListener listener ) { checkWidget ( ) ; if ( listener == null ) { SWT . error ( SWT . ERROR_NULL_ARGUMENT ) ; } if ( selectionChangeListeners == null ) { return ; } selectionChangeListeners . remove ( listener ) ; }
target:  Removes the listener from the collection of listeners who will be notified when the user changes the receiver's selection.