another stub update index fix:

- stubs doesn't get buffered status update notifications because they aren't built out of unsaved documents
- also index read also made affected to buffered status

platform/lang-impl/src/com/intellij/util/indexing/FileBasedIndexImpl.java

@@ -1450,6 +1450,7 @@ public class FileBasedIndexImpl extends FileBasedIndex {
 
             // if we have uncommitted documents in unsaved documents, we may index old psi with new uncommitted doc,
             // to properly reindex with new psi / new doc we don't mark index up to date in this case (IDEA-111448)
+            myUpToDateIndices.add(indexId);
           }
         }
       }
@@ -1603,6 +1604,7 @@ public class FileBasedIndexImpl extends FileBasedIndex {
     for (ID<?, ?> indexId : myIndices.keySet()) {
       final MapReduceIndex index = (MapReduceIndex)getIndex(indexId);
       assert index != null;
+      if (myPsiDependentIndices.contains(indexId)) continue;
       final IndexStorage indexStorage = index.getStorage();
       ((MemoryIndexStorage)indexStorage).setBufferingEnabled(enabled);
     }

platform/lang-impl/src/com/intellij/util/indexing/MemoryIndexStorage.java

@@ -187,9 +187,11 @@ public class MemoryIndexStorage<Key, Value> implements IndexStorage<Key, Value>
   @Override
   @NotNull
   public ValueContainer<Value> read(final Key key) throws StorageException {
-    final ValueContainer<Value> valueContainer = myMap.get(key);
-    if (valueContainer != null) {
-      return valueContainer;
+    if (myBufferingEnabled.get()) {
+      final ValueContainer<Value> valueContainer = myMap.get(key);
+      if (valueContainer != null) {
+        return valueContainer;
+      }
     }
 
     return myBackendStorage.read(key);