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In some scenarios, it was possible to trigger a bug in the installability tester, where it would fail to update the "choices" set. The requirements for triggering this seems to be something like: * Obtain a choice that is possible to solve. * Resolve the choice without recursing (with a backtrack point) * Obtain a second choice that is impossible to solve. After the two first steps, the installability tester would fail to update the "choices" set (or, rather, changes would be invisible to the "_pick_choice" function). Fortunately, most packages are either trivially installable or trivially uninstallable, so the bug seems to be rather rare if triggred at all. Signed-off-by: Niels Thykier <niels@thykier.net>