Jeffrey Salmond 6b3e173331 Remove extensions from view in the correct order (#12961) ... When removing packages from a view, extensions were being deactivated in an arbitrary order. Extensions must be deactivated in preorder traversal (dependents before dependencies), so when this order was violated the view update would fail. This commit ensures that views deactivate extensions based on a preorder traversal and adds a test for it.		2020-01-08 15:52:39 -08:00
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spack	Remove extensions from view in the correct order (#12961)	2020-01-08 15:52:39 -08:00