Bug 446745

Description of problem:
gnome-packagekit offers the possibility to check informations on the selected
package. However, every click on a new package, or on a different information
(i.e. description, file list, ...) will launch a new yum (or other backend)
query to fetch those informations.

Version-Release number of selected component (if applicable):
gnome-packagekit-0.1.12-12.20080430.fc9.x86_64

How reproducible:
Always

Steps to Reproduce:
1. Play a little with installer / updater
2. Select a package, click on another
3. Switch tabs on the same package
  
Actual results:
gnome-packagekit launches a new backend request for each change

Expected results:
gnome-packagekit should be a little wiser.

* for updater:
The number of packages to update (and thus review) is usually not very big. So
gnome-packagekit could launch only one query, fetch all informations for all
packages, and then display them when you select a package (as pup was doing).

In fact, this makes sense as if you are reviewing packages to update, you
probably want as much informations on those updates as possible (bug fixed, etc...).

* for the installer:
Obviously, the installer can't behave the same way as the number of packages is
just too important. However, improvements could be made.

For instance, when you select a package, all informations for this package
should be fetched, so that when you switch to another tab, the transition is
smoother.