Filter out duplicate navigation targets for references in library source

idea/idea-analysis/src/org/jetbrains/jet/plugin/codeInsight/DescriptorToDeclarationUtil.kt

@@ -57,7 +57,9 @@ public object DescriptorToDeclarationUtil {
             result.addIfNotNull(psiFacade.findPackage(fqName))
             result.addIfNotNull(psiFacade.findClass(fqName, project.allScope()))
         }
-        return result
+        // filter out elements which are navigate to some other element of the result
+        // this is needed to avoid duplicated results for references to declaration in same library source file
+        return result.filter { element -> result.none { element != it && it.getNavigationElement() == element } }
     }
 
     private fun findDecompiledAndBuiltInDeclarations(project: Project, descriptor: DeclarationDescriptor): Collection<PsiElement> {