Hiding in-between columns just makes their titles go away, breaks resizing

Steps to reproduce:

1. From View > Columns, hide all but (for example) Title and Username
2. Try to scale Title column smaller by dragging the separator between it and the Username column to the left.

What happens:
A new, blank column appears between the two columns and grows bigger as I try to make Title column smaller.

What I expect to happen.
For Title column to get smaller, Username column to expand into the space being freed.

Further info:
This is on up-to-date Quantal, up-to-date Precise is also affected.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: keepassx 0.4.3-1ubuntu2
ProcVersionSignature: Ubuntu 3.5.0-8.8-generic 3.5.0
Uname: Linux 3.5.0-8-generic x86_64
ApportVersion: 2.4-0ubuntu6
Architecture: amd64
Date: Sun Aug 5 21:23:13 2012
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110531.1)
SourcePackage: keepassx
UpgradeStatus: No upgrade log present (probably fresh install)