update-manager does not reflect dependencies in its display when (un)selecting packages

When deselecting and re-selecting packages for update, update-manager does not indicate that there are dependencies that require that other packages are also updated.

I deselected all packages and selected a single package for installing - a package that is dependent on the same version of another package.
Update manager still shows only the first package selected, and a total line of '1 package selected'.
When executing the update, all dependent packages are downloaded and installed (see screen shots).

Expected behaviour: When selecting a package for update, all other packages that have to be installed to satisfy the dependencies are also shown as selected, and the total line below the list correctly shows the number of packages that will be updated.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: update-manager 1:0.156.14.1
ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
Uname: Linux 3.2.0-24-generic i686
ApportVersion: 2.0.1-0ubuntu7
Aptdaemon:

Architecture: i386
CurrentDmesg.txt:
 [ 164.098670] init: plymouth-stop pre-start process (2251) terminated with status 1
 [ 454.418675] PPP BSD Compression module registered
 [ 454.508362] PPP Deflate Compression module registered
 [ 1700.829171] sdd: detected capacity change from 7864320000 to 0
 [ 1706.773690] usb 1-1.3: USB disconnect, device number 6
Date: Fri May 11 17:48:33 2012
ExecutablePath: /usr/bin/update-manager
GsettingsChanges:
 com.ubuntu.update-manager first-run false
 com.ubuntu.update-manager launch-time 1336749346
 com.ubuntu.update-manager show-details true
 com.ubuntu.update-manager window-height 679
 com.ubuntu.update-manager window-width 811
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100427.1)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
SourcePackage: update-manager
UpgradeStatus: Upgraded to precise on 2012-04-26 (14 days ago)