@Contract(pure=true)
  public @NotNull LookupElementBuilder withInsertHandler(@Nullable InsertHandler<LookupElement> insertHandler) {
    return cloneWithUserData(myLookupString, myObject, insertHandler, myRenderer, myExpensiveRenderer, myHardcodedPresentation,
                             myPsiElement, myAllLookupStrings, myCaseSensitive);
  }
@Contract(pure=true)
  public @NotNull LookupElementBuilder withInsertHandler(@Nullable InsertHandler<LookupElement> insertHandler)