Massimiliano Culpo 4ed5c366fa Enforce uniqueness of the version_weight atom per node ... fixes #22565 This change enforces the uniqueness of the version_weight atom per node(Package) in the DAG. It does so by applying FTSE and adding an extra layer of indirection with the possible_version_weight/2 atom. Before this change it may have happened that for the same node two different version_weight/2 were in the answer set, each of which referred to a different spec with the same version, and their weights would sum up. This lead to unexpected result like preferring to build a new version of an external if the external version was older.		2021-03-29 16:06:11 -07:00
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spack	Enforce uniqueness of the version_weight atom per node	2021-03-29 16:06:11 -07:00