When removing packages requires additional removals, indicate which package is causing the change

[cbutcher]

Please allow a user to see which package(s) that were manually selected lead to the automatic removal of each package in the "will be automatically removed" list.

If you select some packages to remove, sometimes the uninstall dialog lists a collection of packages that depend on something you've selected.

These must also be removed if you want to remove whatever you selected (so as not to leave them broken).

However, if I select a collection of packages to remove, and see something in this list I want to retain, it can be difficult to see which package I should remove from my selection (after pressing cancel) in order to not trigger the removal of the package I want to retain.