None of the zoom options seem to allow for 'scale to fit' behaviour

In the past I could set gthumb to automatically scale images that were too big down to the viewing window size, and those that were too small up.

Now it seems the option to allow for the autoscaling of small images up is no longer present - or at least the closest option that looks like it should do that ("Fit to window") doesn't, only doing the first bit (scaling down larger images) but not zooming smaller ones.

For viewing larger image sets of varying sizes - this is very irritating. One has to hit + or Shift X or click a toolbar button repeatedly. Could this functionality please be restored?

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: gthumb 3:2.13.1-1
ProcVersionSignature: Ubuntu 2.6.38-11.50-generic 2.6.38.8
Uname: Linux 2.6.38-11-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Wed Oct 5 01:29:50 2011
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Release Candidate amd64 (20100419.1)
ProcEnviron:
 LANGUAGE=en_AU:en
 LANG=en_AU.UTF-8
 SHELL=/bin/bash
SourcePackage: gthumb
UpgradeStatus: Upgraded to natty on 2011-05-31 (126 days ago)