on lookup reuse, the ads should be cleared

platform/lang-impl/src/com/intellij/codeInsight/lookup/impl/Advertiser.java

@@ -82,6 +82,10 @@ public class Advertiser implements Disposable {
     return new ArrayList<String>(myTexts);
   }
 
+  public synchronized void clearAdvertisements() {
+    myTexts.clear();
+  }
+
   private static Font adFont() {
     Font font = UIUtil.getLabelFont();
     return font.deriveFont((float)(font.getSize() - 2));

platform/lang-impl/src/com/intellij/codeInsight/lookup/impl/LookupImpl.java

@@ -1161,7 +1161,7 @@ public class LookupImpl extends LightweightHint implements Lookup, Disposable {
   public void markReused() {
     myReused = true;
     myModel.clearItems();
-    setAdvertisementText(null);
+    myAdComponent.clearAdvertisements();
     myPreselectedItem = null;
   }