shrink-window-if-larger-than-buffer broken in CVS

Hi, I'm playing with the CVS version of XEmacs 21.2. A problem I'm experiencing is that shrink-window-if-larger-than buffer never works. If I plug the CVS version of that defun into 21.1.10, it functions correctly. One of the functions that shrink-window-if-larger-than-buffer calls must have changed since 21.1.10, breaking shrink-window-if-larger-than-buffer. Or am I doing something wrong? All I'm going on is that "C-x -" works in XEmacs 21.1.10, even with the CVS version of shrink-window-if-larger-than-buffer, but in XEmacs 21.2 it doesn't work, even with the old version of the code. Thanks, Aaron Lehmann