Software Sources can say packages info is outdated even when it's not

How to reproduce:

1. Run Software Sources
2. Make some change in the repo list
3. Revert it manually (without clicking the "Revert" button")

What happens:

The dialog that packages info is outdated and needs to be updated pops up.

What should happen:

Program should be smart enough to recognize that no change was made. If there is a "Revert" button, that means the program _knows_ the original state and can compare with it already upon closing.

Sure there is a "Revert" button. But it's not about that button. It's about the program not covering the "other" use case. This is a Bad Thing from usability and convenience standpoint.

ProblemType: Bug
Architecture: i386
Date: Mon Dec 28 06:31:56 2009
DistroRelease: Ubuntu 9.10
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
Package: software-properties-gtk 0.75.4
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-16.53-generic-pae
SourcePackage: software-properties
Uname: Linux 2.6.31-16-generic-pae i686