Fix ImportLens plugin to work with GHC 8.10

Author: Ailrun

src/Ide/Plugin/ImportLens.hs

@@ -140,7 +140,7 @@ generateLens pId uri minImports (L src imp)
   | ImportDecl{ideclHiding = Just (False,_)} <- imp
   = return Nothing
   -- Qualified case
-  | ImportDecl{ideclQualified = True} <- imp
+  | isQualifiedImport imp
   = return Nothing
   -- No explicit import list
   | RealSrcSpan l <- src
@@ -171,3 +171,12 @@ generateLens pId uri minImports (L src imp)
 -- | A helper to run ide actions
 runIde :: IdeState -> Action a -> IO a
 runIde state = runAction "importLens" state
+
+isQualifiedImport :: ImportDecl -> Bool
+#if MIN_GHC_API_VERSION(8,10,0)
+isQualifiedImport ImportDecl{ideclQualified = GHC.NotQualified} = False
+isQualifiedImport ImportDecl{ideclQualified = GHC.NotQualified} = True
+#else
+isQualifiedImport ImportDecl{ideclQualified} = ideclQualified
+#endif
+