Confirmation window needlessly exceeds screen height and cannot be resized. Access to the vital buttons is difficult

[Teo]

While doing the distribution upgrade from 13.04 to 13.10, after the "Preparing to upgrade" and "Setting new software channels" phases were finished and before the "Getting new packages" one started, a window popped up with the usual information and warnings. After I clicked on the "Details" button, the the window expanded to a height much bigger than necessary (that is, there was plenty of empty space in it; perhaps this was the height that would be needed if all of the collapsed-by-default items in the Details box were to be unfolded). exceeding total screen height.
This is the first fault: window height should only expand as needed and _always_ be kept within the area of the screen (if more is needed, then it must have a scroller).
The buttons to proceed or cancel were both outside the screen, below the bottom.

Furthermore, the window could not be resized in height. Usually you can reduce (or increase) the height of a window by dragging its top border. In this case the top border would act as a handle but you could not drag it downwards, as if the window was at its minimum height and could not be shrinked. This is the second fault: no matter what, you must be able to resize this window. If you resize it to a size too small to contain all the content, then a scroller should appear.

After a few seconds of panic, I realised I could move the window upwards by alt-clicking on it and dragging it. This way I could access its continue button.

Not a big deal but definitely a usability bug.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: ubuntu-release-upgrader-core 1:0.192.13
ProcVersionSignature: Ubuntu 3.8.0-35.50-generic 3.8.13.13
Uname: Linux 3.8.0-35-generic x86_64
ApportVersion: 2.9.2-0ubuntu8.5
Architecture: amd64
CrashDB: ubuntu
Date: Sat Feb 22 23:34:57 2014
InstallationDate: Installed on 2013-10-11 (134 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: dist-upgrade
UpgradeStatus: Upgraded to raring on 2014-02-22 (0 days ago)
VarLogDistupgradeTermlog: