_addEventListeners()

in gr-editor/gr-editor.js [169:179]


  _addEventListeners() {
    this.mirror.addEventListener('content-change', e => {
      this.dispatchEvent(
          new CustomEvent('content-change', {
            detail: {value: e.detail.value},
            bubbles: true,
            composed: true,
          })
      );
    });
  }