Cabal file lookup: fix handling of `hs-source-dirs: .`

tweag / ormolu

A formatter for Haskell source code

https://ormolu-live.tweag.io

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Closed amesgen closed 2 years ago

amesgen commented 2 years ago

Closes #909

Also added regression tests for this and the empty/missing hs-source-dirs bug I fixed in #783.