Fix "after edit" experiments

When the example includes >1 modules, we have to wait for the progress
start of every edit. This is the sequence of events:

--> didChange A.hs
--> didChange B.hs
<-- ProgressStart (for A.hs change)
<-- ProgressDone (aborted)
<-- ProgressStart (for B.hs change)
<-- ProgressDone

The experiment needs to ignore the aborted progress done events and wait until the last progress done event.
To accomplish this, we wait for all the progress start events and then
wait for one progress done event

ghcide/bench/lib/Experiments.hs

@@ -74,10 +74,10 @@ experiments =
         isJust <$> getHover doc (fromJust identifierP),
       ---------------------------------------------------------------------------------------
       bench "edit" $ \docs -> do
-        forM_ docs $ \DocumentPositions{..} ->
+        forM_ docs $ \DocumentPositions{..} -> do
           changeDoc doc [charEdit stringLiteralP]
-        -- wait for a fresh build start
-        waitForProgressStart
+          -- wait for a fresh build start
+          waitForProgressStart
         -- wait for the build to be finished
         waitForProgressDone
         return True,
@@ -121,8 +121,9 @@ experiments =
         ( \docs -> do
             unless (any (isJust . identifierP) docs) $
                 error "None of the example modules is suitable for this experiment"
-            forM_ docs $ \DocumentPositions{..} ->
+            forM_ docs $ \DocumentPositions{..} -> do
                 forM_ identifierP $ \p -> changeDoc doc [charEdit p]
+                waitForProgressStart
             waitForProgressDone
         )
         ( \docs -> not . null . catMaybes <$> forM docs (\DocumentPositions{..} ->
@@ -139,8 +140,9 @@ experiments =
                 forM_ identifierP $ \p -> changeDoc doc [charEdit p]
         )
         ( \docs -> do
-            forM_ docs $ \DocumentPositions{..} ->
+            forM_ docs $ \DocumentPositions{..} -> do
               changeDoc doc [charEdit stringLiteralP]
+              waitForProgressStart
             waitForProgressDone
             not . null . catMaybes <$> forM docs (\DocumentPositions{..} -> do
               forM identifierP $ \p ->
@@ -160,8 +162,9 @@ experiments =
             liftIO $ appendFile (fromJust $ uriToFilePath hieYamlUri) "##\n"
             sendNotification SWorkspaceDidChangeWatchedFiles $ DidChangeWatchedFilesParams $
                 List [ FileEvent hieYamlUri FcChanged ]
-            forM_ docs $ \DocumentPositions{..} ->
+            forM_ docs $ \DocumentPositions{..} -> do
               changeDoc doc [charEdit stringLiteralP]
+              waitForProgressStart
             waitForProgressDone
             not . null . catMaybes <$> forM docs (\DocumentPositions{..} -> do
               forM identifierP $ \p ->