Let cabal-fix do its magic + small tweaks

StateVar.cabal

@@ -1,74 +1,72 @@
+cabal-version: 3.4
 name: StateVar
 version: 1.2.2
-synopsis: State variables
-description:
-  This package contains state variables, which are references in the IO monad,
-  like IORefs or parts of the OpenGL state.
-homepage: https://github.com/haskell-opengl/StateVar
-bug-reports: https://github.com/haskell-opengl/StateVar/issues
-copyright: Copyright (C) 2014-2015 Edward A. Kmett, 2009-2021 Sven Panne
-license: BSD3
+license: BSD-3-Clause
 license-file: LICENSE
+copyright:
+    Copyright (C) 2014-2015 Edward A. Kmett, 2009-2021 Sven Panne
+category: Data
 author: Sven Panne and Edward Kmett
 maintainer: Sven Panne <[email protected]>
-category: Data
+homepage: https://github.com/haskell-opengl/StateVar
+bug-reports: https://github.com/haskell-opengl/StateVar/issues
+synopsis: State variables
+description:
+    This package contains state variables, which are references in the IO monad,
+    like IORefs or parts of the OpenGL state.
 build-type: Simple
 tested-with:
-  GHC == 7.0.4
-  GHC == 7.2.2
-  GHC == 7.4.2
-  GHC == 7.6.3
-  GHC == 7.8.4
-  GHC == 7.10.3
-  GHC == 8.0.2
-  GHC == 8.2.2
-  GHC == 8.4.4
-  GHC == 8.6.5
-  GHC == 8.8.4
-  GHC == 8.10.7
-  GHC == 9.0.2
-  GHC == 9.2.8
-  GHC == 9.4.8
-  GHC == 9.6.4
-  GHC == 9.8.1
-cabal-version: >= 1.10
-extra-source-files:
-  README.md
-  CHANGELOG.md
-
-library
-  exposed-modules:
-    Data.StateVar
+    GHC == 7.0.4
+    GHC == 7.10.3
+    GHC == 7.2.2
+    GHC == 7.4.2
+    GHC == 7.6.3
+    GHC == 7.8.4
+    GHC == 8.0.2
+    GHC == 8.10.7
+    GHC == 8.2.2
+    GHC == 8.4.4
+    GHC == 8.6.5
+    GHC == 8.8.4
+    GHC == 9.0.2
+    GHC == 9.2.8
+    GHC == 9.4.8
+    GHC == 9.6.4
+    GHC == 9.8.1
+extra-doc-files:
+    CHANGELOG.md
+    README.md
 
-  build-depends:
-    base         >= 4   && < 5,
-    stm          >= 2.3.0.1 && < 2.6,
-    transformers >= 0.3 && < 0.7
+source-repository head
+    type: git
+    location: https://github.com/haskell-opengl/StateVar.git
 
-  default-language: Haskell2010
-  default-extensions:
-    TypeOperators
-  other-extensions:
-    CPP
-    DeriveDataTypeable
-    MultiParamTypeClasses
-    FunctionalDependencies
-    FlexibleInstances
-    TypeFamilies
+library
+    default-language: Haskell2010
+    hs-source-dirs: src
+    build-depends:
+        , base         >=4 && <5
+        , stm          >=2.3.0.1 && <2.6
+        , transformers >=0.3 && <0.7
+    exposed-modules: Data.StateVar
+    default-extensions: TypeOperators
+    ghc-options: -Wall
+    other-extensions:
+        CPP
+        DeriveDataTypeable
+        MultiParamTypeClasses
+        FunctionalDependencies
+        FlexibleInstances
+        TypeFamilies
 
-  hs-source-dirs: src
-  ghc-options: -Wall
-  if impl(ghc > 8)
-    ghc-options: -Wcompat
-  if impl(ghc>=7.4)
-    -- other-extensions: DefaultSignatures
-    cpp-options: -DUSE_DEFAULT_SIGNATURES=1
+    if impl ( ghc > 8 )
+        ghc-options: -Wcompat
 
-  if impl(ghc >= 9.0)
-    -- these flags may abort compilation with GHC-8.10
-    -- https://gitlab.haskell.org/ghc/ghc/-/merge_requests/3295
-    ghc-options: -Winferred-safe-imports -Wmissing-safe-haskell-mode
+    if impl ( ghc >= 7.4 )
+        -- other-extensions: DefaultSignatures
+        cpp-options: -DUSE_DEFAULT_SIGNATURES=1
 
-source-repository head
-  type: git
-  location: https://github.com/haskell-opengl/StateVar.git
+    if impl ( ghc >= 9.0 )
+        -- these flags may abort compilation with GHC-8.10
+        -- https://gitlab.haskell.org/ghc/ghc/-/merge_requests/3295
+        ghc-options: -Winferred-safe-imports -Wmissing-safe-haskell-mode