@NotNull
  private LookupImpl obtainLookup(Editor editor) {
    CompletionAssertions.checkEditorValid(editor);
    LookupImpl existing = (LookupImpl) LookupManager.getActiveLookup(editor);
    if (existing != null && existing.isCompletion()) {
      existing.markReused();
      if (!autopopup) {
        existing.setFocusDegree(LookupImpl.FocusDegree.FOCUSED);
      }
      return existing;
    }

    LookupImpl lookup =
        (LookupImpl)
            LookupManager.getInstance(editor.getProject())
                .createLookup(
                    editor, LookupElement.EMPTY_ARRAY, "", new LookupArranger.DefaultArranger());
    if (editor.isOneLineMode()) {
      lookup.setCancelOnClickOutside(true);
      lookup.setCancelOnOtherWindowOpen(true);
    }
    lookup.setFocusDegree(
        autopopup ? LookupImpl.FocusDegree.UNFOCUSED : LookupImpl.FocusDegree.FOCUSED);
    return lookup;
  }