q66 85b8b3bbb7 lib/package_alternatives.c: prune obsolete alternatives groups ...

In the edge case when an updated package has different (or no)
alternatives groups, make sure to prune those that are in pkgdb
but not in the newly installed package.

A potentially common case of this is when a package that formerly
had alternatives gets removed and a transitional metapackage
takes its place (which has no alternatives).

When the new package has no dependencies, oldest next possible
alternatives group will be used. This is because that indicates
a removed package. When there are dependencies, the newest one
will be used; as this indicates a transitional package.

2019-11-17 13:22:15 +01:00

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