reverting back dumb service message propagation. It seems like PsiModificationTracker do the trick (propagates to the parent).

platform/core-api/src/com/intellij/openapi/project/DumbService.java

@@ -44,7 +44,7 @@ public abstract class DumbService {
   /**
    * @see com.intellij.openapi.project.Project#getMessageBus()
    */
-  public static final Topic<DumbModeListener> DUMB_MODE = new Topic<DumbModeListener>("dumb mode", DumbModeListener.class, Topic.BroadcastDirection.TO_PARENT);
+  public static final Topic<DumbModeListener> DUMB_MODE = new Topic<DumbModeListener>("dumb mode", DumbModeListener.class);
 
   /**
    * @return whether IntelliJ IDEA is in dumb mode, which means that right now indices are updated in background.

platform/lang-impl/src/com/intellij/ui/IconDeferrerImpl.java

@@ -20,7 +20,6 @@
 package com.intellij.ui;
 
 import com.intellij.openapi.application.ApplicationManager;
-import com.intellij.openapi.project.DumbService;
 import com.intellij.psi.util.PsiModificationTracker;
 import com.intellij.util.Function;
 import com.intellij.util.messages.MessageBus;
@@ -43,17 +42,6 @@ public class IconDeferrerImpl extends IconDeferrer {
         clear();
       }
     });
-
-    connection.subscribe(DumbService.DUMB_MODE, new DumbService.DumbModeListener() {
-      @Override
-      public void enteredDumbMode() {
-      }
-
-      @Override
-      public void exitDumbMode() {
-        clear();
-      }
-    });
   }
 
   private void clear() {