When display-buffer has been changed to four args?

Hi, can anybody tell me, when display-buffer gots its forth argument SHRINK-TO-FIT (same for get-frame-for-buffer)? In 21.4.6 get-frame-for-buffer does not accept these 4 arguments - so i assume display-buffer doesn't too. In my 21.4.13 version display-buffer and get-frame-for-buffer accept this SHRINK-TO-FIT argument. So my question: In which version of XEmacs 21.4 this has been changed? Or which version of window-xemacs.el is the last one which contains display-buffer *without* the SHRINK-TO-FIT-argument. Same for frame.el (which contains get-frame-for-buffer) Thanks a lot for this information, Klaus