question: public void removeListener ( FSMouseListener l ) { if ( l == null ) { return ; } if ( _handlers . containsKey ( l ) ) { _handlers . remove ( l ) ; } if ( _enabled && _handlers . size ( ) == 0 ) { _panel . removeMouseListener ( this ) ; _panel . removeMouseMotionListener ( this ) ; _enabled = false ; } }
target:  Removes the given listener, after which it will no longer receive callbacks on mouse events.