protected @NotNull InsertHandler<LookupElement> createKeyInsertHandler(@Nullable Project project,
                                                                         boolean needsSequenceItemMark,
                                                                         @NotNull Field childField) {
    return new YamlKeyInsertHandlerImpl(needsSequenceItemMark, childField);
  }
protected @NotNull InsertHandler<LookupElement> createKeyInsertHandler(@Nullable Project project,
                                                                         boolean needsSequenceItemMark,
                                                                         @NotNull Field childField)