Package name list sorting doesn't work

[Uqbar]

The package name list sort doesn't work if I have a filter.
How to reproduce:

0. Open muon.
1. In the filtering input field write anything (I used "anything") and press ENTER.
2. Click in the package name heade and you'll see a small arrow on the package sub-window header.
3. Click more times on the same in order to toggle ascending/descending sort flag.

Expected Behavior
The package list is sorted in either direction accordingly to the package name.

Actual result
The package list of names changes somehow, but it's far from being sorted.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: muon 1.3.1-0ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-23.31-lowlatency 3.2.14
Uname: Linux 3.2.0-23-lowlatency x86_64
ApportVersion: 2.0.1-0ubuntu8
Architecture: amd64
Date: Fri Jul 13 15:00:13 2012
InstallationMedia: Kubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120424)
SourcePackage: muon
UpgradeStatus: No upgrade log present (probably fresh install)

[Jonathan Thomas (echidnaman)]

Fixed in 1.4.