fix: handle comma in extend import list with ghc 9.2

The comma annotation was missing.

Close #2662.

Author: guibou

configuration-ghc-921.nix

@@ -26,7 +26,6 @@ let
           "-f-hlint"
           "-f-haddockComments"
           "-f-alternateNumberFormat"
-          "-f-eval"
         ]) { };
 
       # YOLO

ghcide/src/Development/IDE/Plugin/CodeAction/ExactPrint.hs

@@ -49,7 +49,7 @@ import           GHC (AddEpAnn (..), AnnContext (..), AnnParen (..),
                       DeltaPos (SameLine), EpAnn (..), EpaLocation (EpaDelta),
                       IsUnicodeSyntax (NormalSyntax),
                       NameAdornment (NameParens), NameAnn (..), addAnns, ann, emptyComments,
-                      reAnnL, AnnList (..))
+                      reAnnL, AnnList (..), TrailingAnn (AddCommaAnn), addTrailingAnnToA)
 #endif
 import           Language.LSP.Types
 import Development.IDE.GHC.Util
@@ -490,11 +490,22 @@ extendImportViaParent df parent child (L l it@ImportDecl{..})
       -- we need change the ann key from `[]` to `:` to keep parens and other anns.
       unless hasSibling $
         transferAnn (L l' $ reverse pre) (L l' [x]) id
+
+      let lies' = reverse pre ++ [x]
 #else
-          x :: LIE GhcPs = reLocA $ L l'' $ IEThingWith listAnn parentLIE NoIEWildcard [childLIE]
           listAnn = epAnn srcParent [AddEpAnn AnnOpenP (epl 1), AddEpAnn AnnCloseP (epl 0)]
+          x :: LIE GhcPs = reLocA $ L l'' $ IEThingWith listAnn parentLIE NoIEWildcard [childLIE]
+
+      x <- pure $ setEntryDP x (SameLine $ if (not (null pre)) then 1 else 0)
+
+      let
+
+          fixLast = if not (null pre) then first addComma else id
+          lies' = over _last fixLast lies ++ [x]
+          lies = reverse pre
+      
 #endif
-      return $ L l it{ideclHiding = Just (hide, L l' $ reverse pre ++ [x])}
+      return $ L l it{ideclHiding = Just (hide, L l' lies')}
 extendImportViaParent _ _ _ _ = lift $ Left "Unable to extend the import list via parent"
 
 unIEWrappedName :: IEWrappedName (IdP GhcPs) -> String

ghcide/test/exe/Main.hs

@@ -1520,7 +1520,7 @@ extendImportTests = testGroup "extend import actions"
                     , "import ModuleA as A (stuffB, (.*))"
                     , "main = print (stuffB .* stuffB)"
                     ])
-        , knownBrokenForGhcVersions [GHC92] "missing comma. #2662" $ testSession "extend single line import with infix constructor" $ template
+        , testSession "extend single line import with infix constructor" $ template
             []
             ("ModuleB.hs", T.unlines
                     [ "module ModuleB where"
@@ -1534,7 +1534,7 @@ extendImportTests = testGroup "extend import actions"
                     , "import Data.List.NonEmpty (fromList, NonEmpty ((:|)))"
                     , "main = case (fromList []) of _ :| _ -> pure ()"
                     ])
-        , knownBrokenForGhcVersions [GHC92] "missing comma. #2662" $ testSession "extend single line import with prefix constructor" $ template
+        , testSession "extend single line import with prefix constructor" $ template
             []
             ("ModuleB.hs", T.unlines
                     [ "module ModuleB where"