introduce HighlightUsagesHandlerBase.selfish property

platform/lang-impl/src/com/intellij/codeInsight/daemon/impl/IdentifierHighlighterPass.java

@@ -82,7 +82,7 @@ public class IdentifierHighlighterPass extends TextEditorHighlightingPass {
         LOG.assertTrue(writeUsage != null, "null text range from " + handler);
       }
       myWriteAccessRanges.addAll(writeUsages);
-      return;
+      if (handler.selfish()) return;
     }
 
     int flags = TargetElementUtil.ELEMENT_NAME_ACCEPTED | TargetElementUtil.REFERENCED_ELEMENT_ACCEPTED;

platform/lang-impl/src/com/intellij/codeInsight/highlighting/HighlightUsagesHandlerBase.java

@@ -124,4 +124,12 @@ public abstract class HighlightUsagesHandlerBase<T extends PsiElement> {
   public List<TextRange> getWriteUsages() {
     return myWriteUsages;
   }
+
+  /**
+   * In case of egoistic handler IdentifierHighlighterPass applies information only from this particular handler.
+   * Otherwise additional information would be collected from reference search as well. 
+   */
+  public boolean selfish() {
+    return true;
+  }
 }