Merge pull request #9683 from mpickering/wip/package-db-fix

cabal-install/src/Distribution/Client/CmdInstall.hs

cabal-install/src/Distribution/Client/DistDirLayout.hs

...rc/Distribution/Client/ProjectBuilding/UnpackedPackage.hs

...l-install/src/Distribution/Client/ProjectOrchestration.hs

cabal-install/src/Distribution/Client/ProjectPlanning.hs

cabal-testsuite/PackageTests/PackageDB/t9678/cabal.test.hs

cabal-testsuite/PackageTests/PackageDB/t9678/p1/CHANGELOG.md

cabal-testsuite/PackageTests/PackageDB/t9678/p1/p1.cabal

cabal-testsuite/PackageTests/PackageDB/t9678/p1/src/MyLib.hs

cabal-testsuite/PackageTests/PackageDB/t9678/p2/CHANGELOG.md

...l-testsuite/PackageTests/PackageDB/t9678/p2/cabal.project

cabal-testsuite/PackageTests/PackageDB/t9678/p2/p2.cabal

cabal-testsuite/PackageTests/PackageDB/t9678/p2/src/MyLib.hs

...PackageTests/PackageDB/t9678/repo/p3-0.1.0.0/CHANGELOG.md

...ite/PackageTests/PackageDB/t9678/repo/p3-0.1.0.0/p3.cabal

...PackageTests/PackageDB/t9678/repo/p3-0.1.0.0/src/MyLib.hs

changelog.d/issue-9678

doc/cabal-project-description-file.rst