no duplicates in java var name suggestions

java/java-impl/src/com/intellij/codeInsight/completion/JavaMemberNameCompletionContributor.java

@@ -361,11 +361,18 @@ public class JavaMemberNameCompletionContributor extends CompletionContributor {
   }
 
   private static void addLookupItems(Set<LookupElement> lookupElements, @Nullable final SuggestedNameInfo callback, PrefixMatcher matcher, String... strings) {
+    outer:
     for (int i = 0; i < strings.length; i++) {
       String name = strings[i];
       if (!matcher.prefixMatches(name)) {
         continue;
       }
+
+      for (LookupElement lookupElement : lookupElements) {
+        if (lookupElement.getAllLookupStrings().contains(name)) {
+          continue outer;
+        }
+      }
       
       LookupElement element = PrioritizedLookupElement.withPriority(LookupElementBuilder.create(name).withAutoCompletionPolicy(AutoCompletionPolicy.GIVE_CHANCE_TO_OVERWRITE), -i);
       if (callback != null) {