__moveOptionsToListboxNode() {
      const slot = /** @type {HTMLSlotElement} */ (
        /** @type {ShadowRoot} */ (this.shadowRoot).getElementById('options-outlet')
      );

      if (slot) {
        moveDefaultSlottablesToTarget(this, this._listboxNode);
        slot.addEventListener('slotchange', () => {
          moveDefaultSlottablesToTarget(this, this._listboxNode);
        });
      }
    }
Moves options put in unnamed slot to slot with [role="listbox"]
@private