flush name storage periodically the same way we do for indices

platform/lang-api/src/com/intellij/psi/stubs/SerializationManager.java

@@ -25,6 +25,7 @@ import java.io.InputStream;
 import java.io.OutputStream;
 
 public abstract class SerializationManager {
+
   public static SerializationManager getInstance() {
     return ApplicationManager.getApplication().getComponent(SerializationManager.class);
   }
@@ -40,4 +41,6 @@ public abstract class SerializationManager {
   public abstract boolean isNameStorageCorrupted();
 
   public abstract void repairNameStorage();
+
+  public abstract void flushNameStorage();
 }

platform/lang-api/src/com/intellij/psi/stubs/SerializationManagerImpl.java

@@ -111,6 +111,11 @@ public class SerializationManagerImpl extends SerializationManager implements Ap
     }
   }
 
+  @Override
+  public void flushNameStorage() {
+    myNameStorage.force();
+  }
+
   public void registerSerializer(@NotNull StubSerializer<? extends StubElement> serializer) {
     myAllSerializers.add(serializer);
     try {

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

@@ -636,6 +636,10 @@ public class FileBasedIndex implements ApplicationComponent {
         requestRebuild(indexId);
       }
     }
+
+    if (!HeavyProcessLatch.INSTANCE.isRunning() && modCount == myLocalModCount) { // do not interfere with 'main' jobs
+      SerializationManager.getInstance().flushNameStorage();
+    }
   }
 
   /**