Call useWithStale instead of useWithStaleFast when calling ParseCabalFields

Add documentation about this choice

Author: VeryMilkyJoe

plugins/hls-cabal-plugin/src/Ide/Plugin/Cabal.hs

@@ -314,14 +314,10 @@ completion recorder ide _ complParams = do
   mVf <- lift $ getVirtualFile $ toNormalizedUri uri
   case (,) <$> mVf <*> uriToFilePath' uri of
     Just (cnts, path) -> do
-      mFields <- liftIO $ runIdeAction "cabal-plugin.fields" (shakeExtras ide) $ useWithStaleFast ParseCabalFields $ toNormalizedFilePath path
-      case mFields of
-        Nothing ->
-          pure . InR $ InR Null
-        Just (fields, _) -> do
-          let pref = Ghcide.getCompletionPrefix position cnts
-          let res = produceCompletions pref path fields
-          liftIO $ fmap InL res
+      mFields <- liftIO $ runAction "cabal-plugin.fields" ide $ use_ ParseCabalFields $ toNormalizedFilePath path
+      let pref = Ghcide.getCompletionPrefix position cnts
+      let res = produceCompletions pref path mFields
+      liftIO $ fmap InL res
     Nothing -> pure . InR $ InR Null
  where
   completerRecorder = cmapWithPrio LogCompletions recorder